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October 24, 2014

Search: dual nature of matter & radiation

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dual nature of matter & radiation
Light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material.If the frequency is halved & intensity is doubled,the photo current becomes 1. Quadrupled 2. Doubled 3. Halved 4. Zero
March 2, 2009 by hriday

Cosmology
In order from earlier to later times, the dominant components of our universe have been: * dark energy, matter, then radiation * dark energy, radiation, then matter * matter, radiation, then dark energy * radiation, matter, then dark energy
January 16, 2013 by qwerty

chemistry
how can i compare the dual nature of light how can i describe the phenomena that can be explained only by the particle model of light. how can i empoly the quantum theory to assess the amount of energy that matter gains and loses how did Einstein utilize Plancks quantum ...
November 6, 2008 by dina

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

9th grade
Explain what is meant by the "dual nature" of light
April 15, 2009 by Jenny

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 didnt really help. Thank you! Where does radiation come from? When is it ...
January 15, 2009 by Amy

english
i have to discuss the dual nature of people. I want to talk about MArc Antony in the Tradgey of julius Caesar but I I know he manipulates but what is his other side?
June 17, 2008 by maggie

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

cycles of matter (life science)
How does the Laws of Conservation of Matter and Energy relate to the Cycles in Nature?
March 24, 2013 by Anonymous

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

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

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

Science
What are some dangers of nuclear radiation that can cause nature
September 22, 2008 by Adam

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

chemistry
How do scientists know that light has a dual wave-particle nature? In what ways does light behave as wave and particle?
November 23, 2008 by ashley

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
Consider an interstellar spaceship powered by matter-antimatter reactions. The energy resulting from the matter-antimatter reactions is ejected from the exhaust as electromagnetic radiation producing thrust. The design goal is to have the thrust produce an acceleration equal ...
February 5, 2014 by Monika

stat
1. The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected 350 observations from population 1 (dual degree students) and 310 from population 2 (MBA students). The ...
November 29, 2010 by jeen

Science
Does infrared radiation or ultraviolet radiation have wavelengths that are shorter than visible light? My answer is ultraviolet radiation. I am really sure about this one. Am I correct?
September 10, 2010 by Reed

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

science
Where does energy come from? Energy can come from the complete destruction of matter (as in nuclear reactions), or the rearrangement of electrons or other charged particles inside matter (as in chemical reactions) or from electromagetic fields (as in light and heat radiation...
July 24, 2006 by Sandra

English
In "A White Heron," having made her choice between an attraction of the heart and her bond with nature, Sylvia A. retains her loyalty to nature and becomes more suspicious of human nature. B. retains her loyalty to nature as her affection for the hunter grows. C. is able to ...
August 25, 2011 by lenae

Science ~ Structures and Properties of Matter
How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot? Help ME PLEASE! PLEASE
January 29, 2014 by Cindy

chemistry
Which is not a true statement concerning electromagnetic radiation? It travels through space at 3.0 x 1010 cm/s. It travels in a straight line. It has the fastest speed possible in nature. The sun is a source of it.
December 1, 2011 by katelyn

physics
a) What is the frequency of a photon of UV radiation ( = 2.00 x 10^-7 m)? (b) Calculate the energy of a photon of UV radiation. (C) What is the frequency of a photon of infrared radiation ( = 1.083 x 10^-6 m)? (d) Calculate the energy of a photon of infrared radiation. (e) How...
February 11, 2012 by hannah

cognitive and langauge devel.
Piagets famous ? problem demonstrates preoperational childrens difficulty with? THREE MOUNTAIN; DUAL REPRESENTATION THREE MOUNTIAN; HIERARCHICAL CLASSIFICATION CLASS INCLUSION; HIERARCHICAL CLASSIFICATION CLASS INCLUSION; DUAL REPRESENTATION THANK YOU FOR THE HELP IAM SO STUCK
August 11, 2011 by jenn w

Advanced Functions - Grade 12
Radiation from the sun keeps us alive, but with the thinning of the ozone layer, it is important to limit exposure. Most of us know that the sun is far more intense at the equator than at the poles. The relationship between the intensity of radiation with respect to the ...
July 20, 2010 by Nish

physics
a radiation survey meter observed gamma radiation of 150 mR/hr. The air field ionization chamber has a volume of 580 cubic cm. If the electron generated by the radiation in the chamber are swept out by an electric field, what is the current produced? please answer, thank you ...
December 8, 2012 by nitz

English
Can you please tell me if the phrases in brackets are possible? Thank you. 1)Wordsworth imagines himself as (like) a cloud which overflows (better: floats over) valleys and hills. 2)Before (Wordsworth) nature was seen as a philosophical entity. Now it starts to be seen as a ...
November 26, 2010 by Franco

Soil Chemistry
Global temperatures are increasing and this increase is probably due to increasing concentrations of greenhouse gases present in A) the troposphere which absorbs outgoing IR radiation B) the stratosphere which absorbs outgoing IR radiation C) the troposphere which absorbs ...
July 5, 2014 by John

Physics
Ray of laser start from the air and collide with the middle side of some matter > How many total internal reflections done in this matter ?? n ( matter)= 1.48 n (air)= 1.00 The length of matter = 42.0 cm The width of matter = 3.1 mm Ray of laser collide by angle =20(degree)
November 14, 2007 by mo

Chemistry
I am wondering if my work makes sense for the following problem: 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 ...
December 6, 2009 by GenChem

English**
Alexander Pope's "An Essay on Criticism. Would this be considered a analogy or personification? Those RULES of old discover'd, not devis'd, Are Nature still, but Nature Methodiz'd; Nature, like Liberty, is but restrain'd By the same Laws which first herself ordain'd. * i ...
May 3, 2011 by Jeanna

EnGliSh
Is Tintern Abbey - Nature about nature, about human nature, or both? Explain, citing lines from the poem to support your ideas
May 6, 2012 by CHEYANNE MARIE

science
What is matter? And four examples of objects/substances that would be classified as ''matter'' Please help me with this question and anyhting else you know about ''matter''
September 17, 2007 by Megan

Chemistry!
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
November 14, 2010 by Alex

statistics
Q. The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected. 100 observations from population 1 (dual degree students) and 100 from population 2 (MBA students). The ...
November 29, 2010 by jeen

Chemistry
A 0.22-caliber handgun fires a 27-g bullet at a velocity of 765 m/s. Calculate the de Broglie wavelength of the bullet. Is the wave nature of matter significant for bullets?
March 28, 2012 by danielle

_____ radiation can damage genes?
Is it ionizing, nonionizing or gamma radiation??
September 15, 2009 by RAYMOND

More chemistry
Hey jiskha. Microwave ovens emit microwave radiation that is absorbed by water. The absorbed radiation is converted to heat that is transferred to other components of the food. Suppose that the microwave radiation has a wavelength of 12.7 cm. How many photons are required to ...
November 14, 2010 by Alex

Physics
for gamma radiation 1rad=1rem, but for alpha radiation 1 rad=20rem. Why is there a difference?
January 14, 2009 by Leila

astronomy
What is teh wavelength of electromagnetic radiation that has a frequenc of 3 x 10 16 Hz? In what part of the spectrum does this radiation occur?
September 29, 2011 by lynn

chemistry
A microwave oven heats by radiating food with microwave radiation which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 liter of water was placed in the oven and the temperature of the water rose from 20 ...
October 31, 2012 by jimmercarbone

chemistry
A microwave oven heats by radiating food with microwave radiation which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 liter of water was placed in the oven and the temperature of the water rose from 20 ...
October 31, 2012 by jimmercarbone

physics
Electromagnetic radiation having a 12.0 m wavelength is classified as infrared radiation. What is its frequency? 1 Hz i got 1.31e+13???
May 29, 2012 by Amelia

Biology
for my sister again. what be 2 examples of short wave radiation that can trigger mutation. she only found uv radiation.
March 8, 2012 by Mohammad

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

chemistry
What would the wavelength of radiation whose frequency is 5.75*10 to the 9th cycles per second be? Name the type of radiation it is?
February 10, 2011 by Elaine

physics
A radar installation that is used to track airplanes transmits electromagnetic radiation with a wavelength of 4 cm. Calculate the frequency of this radiation in Hz.
July 1, 2012 by LL

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!!!!!!!!!!!!!

Engliish Lit-Please check
"Those RULES of old discover'd not devis'd Are nature still, but Nature Mehtodiz'd Nature, Like Liberty is but restrain'd By the same Laws which first herself ordain'd What is this an example of simile hyperbole analogy overstatement personification I'm thinking it is either ...
February 16, 2012 by Jasmine

college physics
A typical wavelength of infrared radiation emitted by your body is 25 m (2.5 multiplied by 10-5 m). What is the energy per photon of such radiation?
April 26, 2010 by Josh

Chemistry!
a microwave oven uses electromagnetic radiation with a wavelength of 3.00x10^6 nm. calculate energy (in joules) of 1.65 moles of photons of this radiation.
April 6, 2011 by Rachel

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
if a scientist working with electromagnetic radiation has detected a frequency of 2.8X10^10Hz for one of the waves, what is the wavelength of this radiation wave?
May 30, 2013 by carmen

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

*updated Chem
I am wondering if my work makes sense for the following problem: 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 ...
December 6, 2009 by GenChem

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

Science - Radiation
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

English
As you know, Anne frequently refers to how much she appreciates and enjoys nature. Why is nature so important to Anne? What does nature represent that she so desires? How do Annes passages on nature in the diary affect her mood and affect the mood of the diary? (this is on ...
February 27, 2011 by Roxy

English Lit-Please help
We had to read An Essay on Criticism by Alexander pope and answers some questins. I spent my weekend trying to figure out one of the questions-Could someone please help "Those Rules of old discover'd, not devis'd Are Nature still, but Nature Medthodiz'd Nature like Liberty is ...
February 20, 2012 by Jody

CHEM URGENT
Infrared, ultraviolet, and visible radiation are all part of the electromagnetic spectrum. Arrange the three types of radiation in order of increasing energy.
January 17, 2009 by james

please correct grammer in my paragraph
The critics of power plants are right: The amount of radiation power plants release is dangerous. However, people dont realize that they are constantly exposed to radiation by various ways. One can get exposed to radiation of 350 millirems from just standing in the sun for a ...
November 1, 2007 by julie

Chem
which of the following statements is true regarding electromagnetic radiation? Options: 1. electromagnetic radiation with a wavelength of 600 nm travels faster than that with a wavelength of 400 nm. 2. the frequency of electromagnetic radiation determines how fast it travels. ...
July 13, 2010 by Ally

Science - 7th grade
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

Math
Radiation from the Sunkeeps us all alive, but with the thinning of the ozone layer, it is important to limitexposure. The intensity of radiation is inverselyproportional to the square of the distance thatthe Suns rays travel.The formula I=k/d^2 models the relationshipbetween ...
October 13, 2014 by Han

science chem
As a radio active material gets older, does it emit less, more or a constant level of radiation per second? There is less matter to convert, and it takes the same time per atom. Of course the activity is less.
April 1, 2007 by sean

CHEMISTRY
An electron undergoes a transition from an n=3 to an n=1 stationary state and red light is released. Which of the following forms of electromagnetic radiation could be released for an n=2 to n=1 electron transition within the same atom? -blue visible light -yellow visible ...
March 20, 2014 by Ashley

IPC
The peak intensity of radiation from Star Beta is 350 nm. In what spectral band is this? a)ultraviolet b)radio waves c)visible light d)infrared radiation help me understand please! <3
May 19, 2011 by Ashley Nicole! <3

science
See i took this practice test and i got a lot wrong i need help its on nature of matter and i need help so my mom can get of my back help me please I'm desperate for help please i beg
January 25, 2010 by Brianna

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

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

CALC -- integrals!
Iodine-131 is used to treat hypo-thyroidism since it is preferentially absorbed by the thyroid and typically involves a total radiation dosage of 10,000,000 millirem. Iodine-131 has a half-life of eight days. 1. Set up the appropriate integral to represent the radiation dosage...
February 4, 2008 by anonymous

chemistry
If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?
July 10, 2011 by g

Chemistry
If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?
November 6, 2011 by Jennifer

physics
suntanning produces cell damage in the skin. why is ultraviolet radiation capable of producing this damage, while visible radiation, even if more intense, is not?
September 2, 2009 by Asaad

Chemistry
Enormous numbers of microwave photons are needed to warm macroscopic samples of matter. A portion of soup containing 225 g water is heated in a microwave oven from 23C to 91C, with radiation of wavelength 1.55 10-2 m. How many photons are absorbed by the water in the soup?
September 15, 2010 by Jon

British Literature
Charlotte Turner Smith's sonnet "Written the close of Spring" best exemplifies what motif? Examples given are the parallels between human existence and nature; the cyclical nature of human existence; the facrt that the happiness of youth comes only once; or the beauty of nature.
February 11, 2012 by Scooby10

Chemistry
Water is exposed to infrared radiation of wavelength 3.010^−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 1.7 g of water by 2.2 K?
November 9, 2009 by Kyle

calculus -- PLEASE HELP!
Iodine-131 is used to treat hypo-thyroidism since it is preferentially absorbed by the thyroid and typically involves a total radiation dosage of 10,000,000 millirem. Iodine-131 has a half-life of eight days. 1. Set up the appropriate integral to represent the radiation dosage...
February 5, 2008 by anonymous

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

chemistry
if you are exposed to all sources of radiation from natural sources and human activities (worldwide average). How many years would it take for you to absorb a fatal dose of radiation plss help
September 24, 2012 by Shay

chemistry
a sample of molybdenum is analysed by x-ray diffraction using Nik(alpha) radiation. calculate value of angle of which the lowest angle of radiation is observed . answer in degrees.
April 28, 2013 by himani.

science
1. How do you know when something is gas? 2. What is gas made of? [I think it's molecules and atoms?] 3. How do you know when something is matter? [I believe that when something has a mass and volume..its matter. Is that correct? 4. Is gas matter? [This question got me ...
January 23, 2008 by Jeanine

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

Physics
One practical application of matter waves is A. Lasers B. X-Rays C. Electron Microscope D. None of the above My guess is A, but I'm not sure. "Matter waves" refers to the wave qualities of matter (as opposed to the particle qualities). Thanks.
April 14, 2009 by Alex

Analytical Chemistry
A photon of an X-ray radiation has a wavelength of 5.50 . For the radiation, calculate the (a)frequency in Hertz, (b)the energy in Joules, (c) the energy in electron volts (eV) and (d) the energy in kJ/mol.
December 9, 2010 by Kelley

Analytical Chemistry
A photon of an X-ray radiation has a wavelength of 5.50 . For the radiation, calculate the (a)frequency in Hertz, (b)the energy in Joules, (c) the energy in electron volts (eV) and (d) the energy in kJ/mol.
December 9, 2010 by Kelley

Astronomy
Basically the ``Bohr radius'' for the dark matter is rB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount of dark matter mass contained inside the ``gravitational atom'', and ℏ and GN are constants as usual. Taking the dark matter to be of ...
October 1, 2013 by qwerty

maths
what is a dual intercept method and how is it applied?
November 2, 2011 by Karabo

chem
A 73-kg person is accidentally exposed for 215 s to a 16-mCi source of beta radiation coming from a sample of 14C. What is the activity of the radiation source in disintegrations per second? In becquerels? i am not sure if there is an equation for this or wut??
September 10, 2012 by sara

Medical billing and coding
patient is admitted for radiation therapy for metastatic bone cancer, primary unknown. PAtient develops severe vomiting secondary to the course of radiation and is kept an extra day for stabilization.
January 9, 2013 by Mike

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

science- I need help!
1. How do you know when something is gas? 2. What is gas made of? [I think it's molecules and atoms?] 3. How do you know when something is matter? [I believe that when something has a mass and volume..its matter. Is that correct? 4. Is gas matter? [This question got me ...
January 23, 2008 by Jeanine

English 4
How does nature in Wordsworth's poetry differ from nature in Byron's description of the Byronic hero?
November 27, 2012 by Monica

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