Wednesday
December 7, 2016

Number of results: 32,765

Why would the seasonal range (summer-Winter) in solar receipt be greater at 61 degrees North than at 40 degrees North?
February 23, 2009 by Mia

SCIENCE
The intensity of solar radiation at the surface of the earth is 1kW/m2 . A roof has a square solar panel of sides 10m that absorbs the radiation completely. What is the average force exerted on the panel?
September 24, 2016 by OWOLABI

college chemistry
A green leaf has a surface area of 2.40 cm^2. If solar radiation is 1120 W/m^2, how many photons strike the leaf every second? Assume three significant figures and an average wavelength of 504 nm for solar radiation.
November 12, 2009 by Eddie

math
Hi, Nearly all of the energy used on earth comes originally from the sun, and that solar radiation is intercepted at 1370 Wm^-^2 at the top of the atomsphere, and that 49%of this radiation is absorbed by the earths surface. If a shallow dish containing ice or warte, placed on ...
December 5, 2008 by carl

Physics
Solar heating takes advantage of solar collectors such as the type shown in the figure . During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m^2. About 50% of this radiation reaches the Earth during daylight hours. (The ...
May 7, 2011 by Alice

chemistry
Calculate the energy of a photon of electromagnetic radiation at each of the following wavelengths.503 nm(wavelength of maximum solar radiation) i need help please!
January 25, 2013 by savannah

EARTH SCIENCE
Some factors that might influence solar radiation on the Martian surface
July 18, 2010 by Anonymous

physics
This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If there is a water flow of ...
December 4, 2010 by bark

physics
This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If there is a water flow of ...
December 7, 2010 by bark

physics
This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these properties be fulfilled? If there is a water flow of...
December 9, 2010 by bark

chemistry
Which of the following statements about UV radiation is/are FALSE? (Select all that apply). ? a. UV B radiation covers a longer wavelength spectrum than UV A radiation. b. UV B radiation has sufficient energy to break any covalent bond. c. UV B radiation covers a frequency ...
September 21, 2008 by Jasmine

Science
You have been commissioned to design a stand]alone solar PV system (solar panels + battery array) for a 1000ft2 occupied between May through October, off]line cottage located near Corpus Cristi, Texas. The PV array should supply the daily average requirement of 7.2 kWh ...
April 15, 2009 by Sarah

Science
All objects emit _____ radiation. A.electromagnetic B.kinetic C.thermal D.solar I think it is A...?
April 8, 2013 by Cassie

Science
how do the wavelengths of radiant energy vary with the temperature of the radiating source? How does this affect solar and terrestrial radiation?
September 17, 2009 by Jordan

Earth Science
What causes the intensity and duration of solar radiation received at any place to vary throughout the year?
October 30, 2010 by Anon

Atmospheric Science
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
September 11, 2014 by Rebekah

Science (weather & climate) -
I just wanted to post this question once more. I have to go offline soon. Please go over my answers. Thanks True or false: 7.Eruptions fom volcanoes decrease global temperatures. I answered false because volcanes spew out CO2 into the atmophere. The 16._________-sphere affects...
January 11, 2009 by Twilight lover

Science-Weather
which statement best explain wy the greenhouse effect incrases earth's average temperature? a. CO2 has a high latent heat b. less infrared raditon escapes to outer space. c. More incoming solar radation is aborbed by the atmosphere. d. less incoming solar radiation is ...
January 12, 2009 by Twilight lover

Science (college level)
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
September 12, 2014 by Jason

science
a material that reduces the flow of heat by conduction, convection, and radiation is a. a solar collector b. a conductor c. and insulator, or d. condensation
January 28, 2009 by delane

1.Asteroids in our solar system are a)planets b)comet remains c)found in an asteroid belt** d)pieces of ice 2.Which of the following would not be found on the electromagnetic spectrum? A)The wavelengths of electromagnetic radiation B)The frequency of electromagnetic radiation ...
December 6, 2016 by katrina

geography
why is the difference in solar receipt between 60N and 30N greater in the winter than in the summer?
October 5, 2010 by TC

global warming science
1a (5 points possible) A schematic of a two layer model of the Earth-atmosphere energy balance is shown in the image below. The atmosphere is assumed to be transparent to solar radiation, and the total solar radiation absorbed by the surface is written in terms of the ...
March 26, 2014 by JuanPro

Science
What would happen to the amounts of solar radiation reflected and absorbed if a large aount of light colored dust was added to the air
September 17, 2011 by Chandler

physical science
Which of the following statements is NOT true? A. You are exposed to nuclear radiation every day. B. Most of the nuclear radiation you are exposed to occurs naturally in the environment. C. Naturally occurring nuclear radiation is called background radiation. D. All natural ...
September 15, 2015 by bee

PHYSICS
Consider a one layer atmosphere for the planet Venus. 19% of incoming solar radiation is absorbed by the atmosphere. 99% of the outgoing radiation is absorbed by the atmosphere. The incoming radiation, E, as measured by satellite is 615 Wm-2. 1) Derive two equations, one for ...
January 24, 2010 by Bubbles

science 3 questions!!
2. A device that can be used both for cooling and heating is a _____. (1 point) heat engine compressor heat pump vaporizer 3. All objects emit _____ radiation. (1 point) electromagnetic kinetic thermal solar 4. Fast food restaurants keep food hot with infrared lamps. The heat ...
April 9, 2013 by jessie

Chemistry
the effective incoming solar radiation per unit area on earth is 342 W/M^2. of this radiation, 6.7 W/m^2 is absorbed by CO2 at 14993 nm in the atmosphere. how many photons at this wavelength are absorbed per second in 1 m^2 by CO2?
December 5, 2015 by Anonymous

Science Sorry I just need help one more time!
Ok I am doing a project in science on radiation. I have to make a brochure. I need help answering these questions about radiation. Or some good sites would be nice too. I looked on google but they didn't really help. Thank you! Where does radiation come from? When is it ...
January 15, 2009 by Amy

physics
A solar collector is placed in direct sunlight where it absorbs energy at the rate of 780 J/s for each square meter of its surface. The emissivity of the solar collector is e = 0.76. What equilibrium temperature does the collector reach? Assume that the only energy loss is due...
November 20, 2016 by Anonymous

Science
September 10, 2010 by Reed

physics
1) A fask has the following features; a plastic stopper glass walls with silver coating on both sides vacuume between walls plasic spacer Which features of the flask reduce energy transfer by: a) radiation b) conduction c) convection 2) Many vacuume flasks have steel walls ...
November 17, 2011 by lissa

to ms.sue- science project part 1
Please select one of the four solar-energy-based topics listed below to research. Based on your research you are to create a poster that details what you learned. Please make a bibliography of the resources that you used for your information, to go along with your poster. ...
June 21, 2012 by Celest

Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80% of ...
January 24, 2010 by RANI

physics
Human skin (choose all that apply) 1. emits radiation well. 2. absorbs radiation well. 3. does not emit radiation well. 4. does not absorb radiation well. 5. has an emissivity of 0.
October 4, 2011 by ice cream

college physics
Human skin (choose all that apply) 1. emits radiation well. 2. absorbs radiation well. 3. does not emit radiation well. 4. does not absorb radiation well. 5. has an emissivity of 0.
October 4, 2011 by ice cream

Science
Henri bacquerels original hypothesis was that florescent minerals became excited by solar energy and gave off X-rays. However, after he discovered uranium minerals emitted their own radiation without the help of solar energy, he abandoned his hypothesis. Why did, Bacquerel ...
March 5, 2015 by Anonymous

Science
On this date, the solar noon radiation values at the top of the atmospheree and at the surface at this place are 1317 WM-2 and 920 WM-2. Why is the surface value lower than the value at the top of the atmosphere?
March 9, 2009 by Mama Mia

help Fast ( physics)
a 0.5 m^2 solar collector radiation from the sun and focuses it on 250g of water that is inially at 23 degrees . the average intensity of radiation arriving from the sun at this location is 550 Wm^-2. if you assume that this is collected with 100% efficiency. how much time is ...
April 27, 2011 by H.T

Biology
_____________provided significant sources of energy on early Earth, and were most likely involved in the origin of life. Options A) Volcanic activity, violent thunderstorms, and ultraviolent radiation B) Bombardment from meteorites, gamma radiation, and osmic radiation. C) ...
August 29, 2007 by Sabrina

help help 9 physics) i need an aswer fast!
a 0.5 m^2 solar collector radiation from the sun and focuses it on 250g of water that is inially at 23 degrees . the average intensity of radiation arriving from the sun at this location is 550 Wm^-2. if you assume that this is collected with 100% efficiency. how much time is ...
April 28, 2011 by H.T

Chemistry
27. Excess exposure to nuclear radiation can cause harm. All of the following statements about radiation are true EXCEPT A. Radiation can damage living tissue because of the high energy associated with the radiation. B. Radiation can damage biological molecules by knocking an ...
June 8, 2014 by Emily

Science
Does a solar powered calculator work when there is no bright light falling on the solar panel? Explain
March 6, 2014 by Cherie

Science
how is radiation different from convection and conduction? Radiation can travel through solids is what i'm thinking.
January 14, 2015 by ski

Science
Need help on this multiple choice question, thanks! Microscopic airborne particulates that reflect incoming solar radiation and thereby tend to cool the atmosphere are called: a. CFCs b. aerosols c. greenhouse gases d. indoor air pollutants e. hazardous air pollutants Thanks ...
November 12, 2009 by Bobby

science
The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the roof has a surface area of 100 m2 and the ...
December 12, 2010 by Kim

chemistry
Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
January 22, 2011 by Maria

chemistry
Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
January 22, 2011 by Maria

PHYSICS
Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80% of ...
January 24, 2010 by Sunshin3

Physics
what type of heat transfer does solar hot water heating use? (conduction, convection, radiation)
March 10, 2014 by Lisa

Science
What are some of the effects of the sun's radiation on the earth's atmosphere including the green house effect, conduction, convection and radiation?
April 10, 2013 by Aj

physics
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
April 14, 2011 by monique

physics
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
April 15, 2011 by niki

physics
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
April 1, 2013 by Ashley

Phyics
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
April 12, 2013 by HELP PLEASE

Physics
The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the total power radiated ...
November 21, 2016 by Dan

physics help
At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar panels if your solar ...
March 27, 2011 by sarah

physics
At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must solar energy reach your solar panels if your solar ...
March 27, 2011 by sarah

science
In the formation of the solar system nearly all of the mass of the solar nebula became ? Answer Are Terrestrial planets GAS giant SUN OORT CLOUD THANK YOU
April 14, 2014 by snow

to ms.sue-science project part 1
so is the project basically asking to write down details abd information i learned about solar cars and to write down the websites? please read this and describe to me: Please select one of the four solar-energy-based topics listed below to research. Based on your research you...
June 21, 2012 by Celest

Astronomy
Where did CMB radiation originate? (a) It is the radiation from the electroweak phase transition when the weak force was spon- taneously broken by the Higgs mechanism. (b) It is radiation from supernovas in the early Universe that produced the heavier elements. (c) The ...
October 1, 2013 by qwerty

earth science
The greenhouse effect is a result of A. absorption and radiation of energy in the atmosphere. B. consumption and radiation of energy in the atmosphere. C. absorption and radiation of energy in the hydrosphere. D. consumption of fruits and vegetables that produce a biofuel. i ...
August 3, 2014 by need help please!!!!!!!!!!!!!

Geography and Society
Which factor has the greatest affect on a season's climate? a. global wind patterns b. ocean currents c. solar radiation*** d. none of the above
March 8, 2016 by Kaai97

Physical Science
What is the apparent contradiction in the statement that "solar energy is free" with the fact that solar cells are too expensive to use as an energy source.
May 4, 2010 by Sue Ann

Health and science
Explains the science, technology, engineering and/or mathematics behind a solar cooker that work day and night and how could a solar cooker that works day ajd night both address the everyday problems and have a broader impact locally or globally.
January 19, 2016 by Anonymous

Science
Facts about the sun are? I have 1. the only star in our solar system 2. sun spots are cooler areas on sun's surface 3. from solar energy 4.Solar flares 5. only star you see during the day 6.made of gas 7.closest star to our earth
November 17, 2011 by Johnny

Earth science
The greenhouse effect is a result of A. consumption of fruits and vegetables that produce a biofuel. B. absorption and radiation of energy in the hydrosphere. C. absorption and radiation of energy in the atmosphere. D. consumption and radiation of energy in the atmosphere. D?
March 13, 2014 by Heather

why are alpha and beta radiation referred to as particles while gamma radiation is referred to as rays?
April 14, 2014 by Anonymous

science
3×10^18 photons of a certain light radiation are found to produce 1.5 j of energy. calculate the wavelength of light radiation
June 14, 2016 by Anonymous

Science
I'm kinda in a rush but take your time!Thx! 1.What was Henri Becquerel studying when he accidentally discovered radioactivity? A.photography B.properties of black light C.properties of X-rays D.solar energy 2.When Marie Curie isolated uranium from pitchblende, she realized ...
January 6, 2015 by I am awesome

Science
Scientists theorize that an increase in atmospheric carbon dioxide level might cause an increase in global temperatures. This theory is based on the fact that carbon dioxide is a. good absorber of infrared radiation b. poor absorber of infrared radiation c. good reflector of ...
January 22, 2009 by Emeralda

A radioactive isotope, used in the agricultural industry has a half life of 8 days. On application, the radiation is emitted is measured at 12500 counts per sec (cps). If the area that it is applied to cannot be used until the radiation strength is less than 50 cps how long ...
January 26, 2013 by Manu

Science
It’s OK to say that your brain is solar powered, because A) mitochondria in plant cells convert solar power to the chemical power that is used to run your brain. B) cellular respiration is powered by sunlight. C) the antenna complex in chloroplasts acts like a tiny solar ...
October 26, 2011 by Frank

Science
It’s OK to say that your brain is solar powered, because A) mitochondria in plant cells convert solar power to the chemical power that is used to run your brain. B) cellular respiration is powered by sunlight. C) the antenna complex in chloroplasts acts like a tiny solar ...
October 26, 2011 by Frank

Is radiation damaging to the health of humans? If so, in what way/ways? My answer is: Yes, radiation though helpful in treating certain diseases is damaging to the health of human beings in many ways one of which being that it mutates our DNA and is unhealthy. It can also make...
January 16, 2014 by Sara

Science
Which radiation causes cancer? I think it is UV radiation, but I'm not sure. Also, A wave goes up and down 5 times in 10 seconds. what is the frequency of the wave in cycles per second (Hertz)
May 2, 2011 by Erika

science
Which radiation causes cancer? I think it is UV radiation, but I'm not sure. Also, A wave goes up and down 5 times in 10 seconds. what is the frequency of the wave in cycles per second (Hertz)
May 2, 2011 by Erika

college Chemistry
Warm objects emit electromagnetic radiation in the infra-red region. Heat lamps employ this principle to generate infra-red radiation. Water absorbs infra-red radiation with wavelengths near 2.80um. Suppose this radiation is absorbed by the water and converted to heat. A 1.00 ...
December 6, 2009 by Need Help

Physics
Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 700.0 kg/m3, what is the maximum thickness of the sail for which...
March 11, 2011 by Daniel

chemistry
There are exactly 60 seconds in a minute, there are exactly 60 minutes in an hour, there are exactly 24 hours in a mean solar day, and there are 365.24 solar days in a solar year. Find the number of seconds in a solar year.
September 3, 2010 by Mely

chemistry
There are exactly 60 seconds in a minute, there are exactly 60 minutes in an hour, there are exactly 24 hours in a mean solar day, and there are 365.24 solar days in a solar year. Find the number of seconds in a solar year.
September 4, 2010 by Mely

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the hydrosphere? Living organisms breathe gases in the atmosphere. Water moves between Earth’s surface and the atmosphere. Gases in the atmosphere trap incoming solar radiation. ...
January 25, 2016 by Oscar

science
1.A scientific law A)can have only one known exception B)can have any number of exceptions as long as we know about them ** C)might have many exceptions we don’t know about D)has no exceptions 2.Sunspots are A) solar storms that can interfere with communication satellites...
December 1, 2016 by katrina

Science
Fast food restaurants keep food hot with infrared lamps. The heat is transferred to the food by _____. condensation conduction convection radiation I think it is radiation...?
April 8, 2013 by Cassie

Solar System Project: I would like to know if the moon is between earth and mars. I am making a shoe box model of the solar system. I have to put the planets in order. That's all I need to know. Thanks a bunch!!!
January 18, 2010 by Miranda

science
dust is often light in color,while soot from fires is generally dark.what would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air?what if a large amount of dark soot was added?
August 31, 2011 by bob

Science
Dust is often light in color, while soot from fires is generally dark. What would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air? What if a large amount of dark soot was added?
September 16, 2010 by Bobert

Space Science
Which objects in the solar system have been least modified since the formation of the solar system? a)asteroids b)Kuiper Belt objects c)meteoroids d)terrestrial planets e)jovian moons
September 27, 2010 by Alice

chemistry
Technetium-99m emits only gamma radiation. Why would this type of radiation be used in diagnostic imaging rather than an isotope that also emits beta or alpha radiation?
October 7, 2012 by Boo Boo

Physics
Can someone check if this is correct or not? Listed following are events or phenomena that occur during either the part of the sunspot cycle known as solar minimum or the part known as solar maximum. Match these items to the correct part of the sunspot cycle. Solar maximum: -...
April 15, 2011 by Misty

Physics
During 2004, japanese scientists successfully tested two solar sails. One had somewhat complicated shape that we shall model as a disk 9 m in diameter and 7.5 um thick. The intensity of solar energy at this location was about 1400 W/m ^2. (a) What force did the sun's light ...
March 31, 2008 by J

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the geosphere? It contains gases that living organisms breathe. It contains gases that trap incoming solar radiation. It provides a medium for cycles that provide nutrients to living ...
December 15, 2015 by Oscar

Earth/Space Science
How does damage to the ozone layer cause a threat to humans? A. It increases radiation of heat from Earth into space. B. It allows damaging infrared radiation to penetrate the atmosphere. C. It allows damaging ultraviolet radiation to penetrate the atmosphere. D. It increases ...
April 2, 2012 by Astrid

science
In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g) ultraviolet radiation), and give out photons of a different kind (e.g visible light). When infrared radiation falls on these materials, visible light is not emitted. Why not? If ...
March 6, 2007 by Kelvin

Science
1. A certain radar installation transmits electromagnetic radiation with a wavelength of 2.5 cm. What is the frequency of this radiation? 2. For the radar above, how many seconds will it take for a signal to reach an airplane 15 km away, and return to the radar installation
November 13, 2012 by Caroline

science
what is the wavelength of radiation with a frequency of 1.50 times 10^13s-1? Does this radiationhave a longer or shorter wavelength than red light? also... What is the energy of a photon of microwave radiation with a frequency of 3.20 times 10^11 s-1?
November 3, 2009 by stephanie

english
Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our ...
February 28, 2009 by dj

ELA
.   Which of the following is the best opening sentence for a business letter that you want to sound fairly informal?       A. This letter is to make you cognizant of our receipt of your order.  B. Your order of February 10 arrived in our office today.  C. Please be ...
May 10, 2015 by Brooklyn

English
A: What do you think of a solar house. 1. I think the solar house makes money for us. 2. I think we can save energy thanks to the solar house. 3. I think we don't need to spend money on electricity. 4. I think we don't need to pay the electricity fee. 5. I think it is a good ...
November 18, 2010 by rfvv

WRITING SKILLS
Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our...
February 13, 2010 by alia

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