The established value for the speed of light in a vacuum is 299 792 458 m/s. What is the orderofmagnitude of this number?
36,525 results
radio message
The nearest star beyond the sun is Alpha Centauri, 4.2 x 1016 meters away. If we received a radio message from the star today, how long ago would it have been sent? The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46

Physics
If the speed of light through material Z is 2.5×10^8 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 10^8 m/s.

calculus help check and help
if an object with mass m is dropped from rest, one model for its speed v after t seconds, taking air resistance into account is v= mg/c(1e^(ct/m)) where g is the acceleration due to gravity and c is a positive constant describing air resistance. a)

Physics
Rank in order the following according to their speeds, from fastest (1) to slowest (5): (i) 425nmwavelength light through a pane of glass, (ii) 500nmwavelength light through air, (iii) 540nmwavelength light through water, (iv) 670nmwavelength light

Science
How can the behavior of light be described as it leaves the vacuum of space and enters the Earth's atmosphere? Questions Light waves slow down as they enter the Earth's atmosphere from space. Light waves continue at the same speed as they enter the Earth's

Chemistry
The speed of light in a vacuum is 2.998 x 10^8 m/s. What is the speed of light in miles per hour? (1 km = 06214 miles)

Physics
use the face that the speed of light in a vacuum is about 3.00 x10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours

Science
Which choice correctly describes a characteristic of an electromagnetic wave? a)An electromagnetic wave moves at the speed of sound. b)An electromagnetic wave in a vacuum moves slightly slower than the speed of light in a vacuum. c)An electromagnetic wave

science
When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelength of UV light? Please use 3 x 108 m/s for the speed of light (c). You will need to upload a file to show how to solve this

ap chem0 frequency
how do u do this type of problem... What is the frequency of a photon with a wavelength of 2.25 102 nm? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 Js c = fw. c is speed of light which you have, f is frequency for

CHEM
The mass of an electron is 9.11*10^31kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31*10^10m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00*10^8m/s. Express your answer numerically

science
Which choice correctly describes the waves in the electromagnetic spectrum? The waves within the electromagnetic spectrum are all longitudinal waves which move at the same speed in a vacuum. The waves within the electromagnetic spectrum are longitudinal

physics
A certain spaceship has a speed of 18200 mi/hr. What is its speed in lightyears/century? A lightyear is the distance that light travels in one year with a speed of 186,000 mi/s.

science
Light waves are traveling through glass. If the wavelength of some part of the light wave is 4 x 107 m and the frequency of that light is 5 x 1014 Hz, what is the speed of light through the glass? 8 x 1022 m/s 1 x 107 m/s 1.25 x 1021 m/s 2 x 108 m/s

physics
Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)

physics
An electron is accelerated from rest through a potential difference that has a magnitude of 2.90 × 107 V. The mass of the electron is 9.11 × 1031 kg, and the negative charge of the electron has a magnitude of 1.60 × 1019 C. (a) What is the

physics
Use the fact that the speed of light in a vacuum is about 3.00x1000 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1 h How many seconds are there in 1 hour if there are 60min/hr and 60sec/min? Then 1hr = 60min/hr x

Math
The speed of light in a vacuum is 299 792 458 m/s what is this written in scientific notation

Organic Chemistry  Refractive Index
Hi, I have a question that I don't know if I am on the right track to answering. If two samples of organic liquids give the same refractive index reading, are the two liquids the same? I know the refractometer is a very precise instrument  up to 8 decimal

speed of light
Can the speed of light be legislated? Explain your reasoning. As best as we know, the speed of light is a fundamental constant of the universe. I have no idea of the meaning "legislated". Someday they may pass laws and light will have to slow down. After

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach

Physic please help!
A mixture of red light (vacuum = 661 nm) and green light (vacuum = 551 nm) shines perpendicularly on a soap film (n = 1.35) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference causes it to look

physics..HELP??? please
in physics terms what does vacuum mean?? i thought they meant a vacuum sweeper?? huh? The question is " The same object is dropped in a vacuum and then in air. Whaich of the parameters( distance,velocity,acceleration) vary and which remain constant during

math
there are two 2's in 299,792,458.name the place value of each 2.explain how their values are related.

physics
A diamond in air is illuminated with white light. On one particular facet, the angle of incidence is 46.05°. Inside the diamond, red light (ë = 660.00 nm in vacuum) is refracted at 17.38° with respect to the normal; blue light (ë = 470.00 nm in vacuum)

Chemistry
What is the wavelength in nanometers of a photon with a frequency of 6.10 ✕ 10^14 sec1? (The speed of light in a vacuum is 2.998 ✕ 108 m/s. Planck's constant is 6.626 ✕ 10^34 J·s.) I know that speed of light = wavelength * velocity, but I don't

Physics
When you approach a blinking source of light, the frequency of its blinking is seen to: decrease, increase, or remain the same always. I THINK IT IS INCREASING. If you are traveling at close to the speed of light and shine a flashlight out in front of you,

Physics,,,,,,,How do I solve this?
Red light always has a lower frequency than blue light. (a) In a vacuum, these two colors are known to travel at the same speed. How do their wavelengths compare in vacuum? Choose one answer only. wavelength of blue > wavelength of red wavelength of red =

Physical Sci
An incandescent light bulb produces light when electrons flow through the (1 point) * air. * glass. * filament. * vacuum. 2. Many streets and parking lots are illuminated with (1 point) * laser lights. * tungstenhalogen lights. * sodiumvapor lights. *

physics
Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)

Physics
You decide to build a cyclotron (because you are bored) that will accelerate protons to 10% of the speed of light. The largest vacuum chamber you can find is 50cm in diameter. What magnetic field strength will you need?

MATH
A light year is the distance that a light travels through a vacuum (space without matter) in one year. A light year is about 9.46 x 10^12km. The distance to the spiral galaxy NGC 4603 is about 1.08 x 10^8 light years. What is the distance in km?

physics
Calculate the frequency in hertz, wavelength in nm, and the velocity in m/s of light inside a material with a refractive index of 1.39. In vacuum, the light has a wavelength of 514.5nm

PHYSICS
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach

Physics
I'm having troubles with a few questions. A tennis ball is thrown vertically upwards. At the top of it's flight, it has: A. a zero speed and acceleration B. a zero speed and constant acceleration C. maximum speed and acceleration D. maximum speed but zero

Significant Figures
I'm having a hard time with significant figures. Any help would be appreciated. The first one is 0.0000000502. I put that it has three significant figures. Is this correct? The other numbers I haven't a clue about are: 5.52 299,792,458 206,265 I get the

Physics
Find the speed of light in flint glass if the index of refraction is n=1.66. How much slower in percent of speed of light in a vacuum c does the light move in each of this medium? v=c/n v=3x10^8m/s/1.66 =1.8x10^8m/s For the percent of speed of light in a

physics
Question Part Points Submissions Used 1 2 3 4 0/0.37 0/0.37 –/0.37 –/0.37 4/15 1/15 0/15 0/15 Total 0/1.48 ...A diamond in air is illuminated with white light. On one particular facet, the angle of incidence is 46.05°. Inside the diamond, red light

physic
How long (in ns) does it take light to travel 1.00 m in vacuum? What distance does light travel in water during the time that it travels 1.00 m in vacuum?

chemistry
The speed of light in a vacuum is 2.998 108 m/s. What is its speed in each of the following units

physics
If the speed of light through material Z is 2.5×108 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 108 m/s.

chemistry
What is the wavelength of a photon with an energy of 6.35 1019 J? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J·s.)

chemistry
What is the energy of a photon with a wavelength of 8.45 102 nm? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J · s.)

Physics please explain
Can you please explain your answer. How did you get blue lamda. Is it because red and green makes blue? How do I find the value of blue lambda? A mixture of red light (vacuum = 661 nm) and green light (vacuum = 551 nm) shines perpendicularly on a soap film

Physics
Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 35.1°. The slab is then immersed in a pool of liquid. When the angle of incidence for the light striking the slab is 21.1°, the angle of refraction for the light

Statistics
Consider the following multiple regression results. Using a= .05 as the significance level, identify all statistically significant predictors. In a relative sense, which variable has the strongest impact? What is the interpretation of the “constant”

Math
n the theory of relativity, the mass of a particle with speed v is m=f(v)=m01−v2/c2√, where m0 is the rest mass of the particle and c is the speed of light in a vacuum. Letting m0=1, find f−1(10).

Physics
1) The speed of light in a certain liquid is 3/5 the speed in a vacuum. What is the index of refraction of the liquid? 2) A ray of light strikes a piece of glass (n=1.52) and makes an angle of 50 degrees with the surface. What angle does the refracted ray

Physics
Light of wavelength 550 nm in vacuum passes through a piece of crown glass of refractive index of 1.52. Find the velocity and frequency of light in crown glass.

Physics
An electron is accelerated from rest through a potential difference that has a magnitude of 2.70 × 107 V. The mass of the electron is 9.11 × 1031 kg, and the negative charge of the electron has a magnitude of 1.60 × 1019 C. (a) What is the

maths
The speed of light is about 2.99x10^8 m/s. If a rocket travels at onefifth the speed of light, find its speed in km/h (in scientific notation correct to 2 significant figures)

applied physics
what angle do blue light wavelength of 460 nm and red light 680 nm disperse upon entering from vacuum to a dispersion medium with n(blue)=1.349 and n(red)=1.213 at an incident angle of 20 degree?

Physics
The established value for the speed of light in a vacuum is 299 792 458 m/s. What is the orderofmagnitude of this number?

math
can someone please help me i am lost. S this is kind of like your problems i can help you and you can help me *** the speed of the light in a vacuum is 299,792,458 meter per second which number, written in scientific notation, is the best approximation of

MATH
1 D = 10^18 statC·cm = 10^10 esu·Å = 1⁄299,792,458×10^−21 C·m ≈ 3.33564×10^−30 C·m ≈ 1.10048498×1023 ≈ 0.393430307 au A dipole of 1 Debye is equal to 3.33 x 1030 C m . Show that in atomic units 1 D = 0.39345 au. The above is the

waves and optics
Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons

physics....
Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons

physics
The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm. a) find the speed of this light in water. b) find the energy of one photon of this light . Does this enerdy change if this

physics
we know that the speed of light in a vacuum is 3.0 x 10^8 m/s (18,000 mi/sec). If light travels through thick plastic with a speed of 1.75 x 10^8 m/s, what is the index of refraction through plastic?

physics
we know that the speed of light in a vacuum is 3.0 x 10^8 m/s (18,000 mi/sec). If light travels through thick plastic with a speed of 1.75 x 10^8 m/s, what is the index of refraction through plastic?

physics
The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm. a) find the speed of this light in water. b) find the energy of one photon of this light . Does this energy change if this

Chemistry
The speed of light in a vacuum is 2.998 × 10^8 m/s. What is its speed in miles per minute (mi/min)? Please explain the steps you used.

physics
Horizontal rays of red light (λ = 660 nm, in vacuum) and violet light (λ = 410 nm, in vacuum) are incident on the flintglass prism shown in the drawing. The indices of refraction for the red and violet light are nred = 1.662 and nviolet = 1.698. The

Science/Physics
The speed of light in a certain medium is 61.2% of the speed of light in vacuum. What is the index of refraction of the medium?

Astronomy
The Universe is filled with a frozen in Higgs condensate. If this were to suddenly disappear/evaporate, what would happen? (a) All bound matter—nucleons (made of quarks), nuclei (made of nucleons), atoms (made of nuclei and electrons), people (made of

Physics
The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?

physics
If the speed of light through material Z is 2.5 × 108 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 108 m/s.

physics
he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.

Astronomy
Few question about astronomy: 1.how many centimetres is equivalent to a lightnanosecond 2. How long is an astronomical unit (AU) in lightminutes (1min, i.e., the distance that light travels in a vacuum in one minute)? Please show the calculation if there

chemistry
What is the frequency of a photon with an energy of 7.40 1018 J? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J·s.)

chemistry
What is the frequency of a photon with a wavelength of 5.60 107 m? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J·s.)

chemistry
What is the energy of a photon with a wavelength of 4.55 106 m? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J·s.)

Physics
Can anyone help me here? I have no idea where to start! Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 35.1°. The slab is then immersed in a pool of liquid. When the angle of incidence for the light striking the slab

chemistry
What is the energy of a photon with a wavelength of 1.45 103 nm? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J·s.)

10th grade
What is the frequency of a photon with a wavelength of 2.50 102 nm? (The speed of light in a vacuum is 2.998 108 m/s. Planck's constant is 6.626 1034 J · s.

chemistry
What is the wavelength, frequency, temperature, and type of the electromagnetic radiation that has: a. 90% the speed of light b. 50% the speed of light c. 10% the speed of light d. 5% the speed of light e. 1% the speed of light

Math
I was trying to answer a question with the formula of time= d/v Q:"an asteroid is 7.98x10^8km from the sun;if the speed of light is 2.99x10^8m/s, how many minutes will it take light from the sun to reach the asteroid." What I did in my calculator:

Beginning Chem.
A. What is the frequency of a photon with a wavelength of 8.35 multiplied by 105 m? (The speed of light in a vacuum is 2.998 multiplied by 108 m/s. Planck's constant is 6.626 multiplied by 1034 J·s.) B. What is the wavelength of a photon with a

math
In the theory of relativity, the mass of a particle with speed v is m=f(v)=m01−v2/c2√, where m0 is the rest mass of the particle and c is the speed of light in a vacuum. Letting m0=1, find f−1(10). f−1(10)=

physics
given a time of fall t = 1.07 s what is the initial height h? You may assume that the acceleration due to gravity g =9.792 𝑚/s^2 (1.07)^2 x 9.792 +11.21 m is this correct?

chemistry
Give the pH of a solution containing 0.344 g of HCL in 792 mL of water. I did .344g/36.5g= .009 mols. then i times that by .792 because i changed that from ml to liters. is that right?

Physics
Monochromatic light (vacuum = 661 nm) shines on a soap film (n = 1.33) that has air on either side of it. The light strikes the film perpendicularly. What is the minimum thickness of the film for which constructive interference causes it to look bright in

Physics
1) The speed of light in a certain liquid is 3/5 the speed in a vacuum. What is the index of refraction of the liquid? 2) A ray of light strikes a piece of glass (n=1.52) and makes an angle of 50 degrees with the surface. What angle does the refracted ray

physic basics
Use the fact that the speed of light in a vacuum is about 3.00 x 10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1.7 hour(s). i converted 1.7 hours to secs but im stuck there and i don't know what to do for the rest

physics
Sound does not travel through a vacuum. How do we know that light does? Explain how you can see ordinary nonluminous classroom objects. Light? Through what medium does starlight reach us? We see nonluminous objects mainly with reflected light.

Physical Science
I need help with a few of these questions: 1.Which of the following waves are mechanical waves? A.light waves B.microwaves C.radio waves D.sound waves I think it's D? 2.Which gives the frequency of the wave in terms of its peaks? A.the height of the

PHYSICS PLLZ HELP
1 wave velocity is related to a period bwavelength camplitude dall of these 2 wave amplitude is related to a wave velocity b frequency c energy dwave length 3which of the following radiation has te smallest frequency? a infrared b visible c

Math>>>>if anyone could check my answer
this problem is difficutl for me i have an answer but im unsure so if someone could check my answer please. heres my problem: A light year is the distance that a light travels through a vacuum (space without matter) in one year. A light year is about 9.46

Physics  EM spectrum
Here's the question: which part of the electromagnetic spectrum has a refractive index of 1.45 in glass? I've attempted to tackle it with v = frequency x wavelength and refractive index = light speed in vacuum / light speed in material but without

physic
Does anybody know how I can find the mass of the electron for this question. I need to find it first to solve for the real one but don't see mass anywhere in the question.I see radiant and speed but no mass The radius of circular electron orbits in the

Physics
In the figure, a small 0.458 kg block slides down a frictionless surface through height h = 1.05 m and then sticks to a uniform vertical rod of mass M = 0.458 kg and length d = 2.70 m. The rod pivots about point O through angle θ before momentarily

physics
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 521 nm, determine the number of photons per second per square meter that reach

chemistry
If 600 mL of 1.05 M aqueous CaCl2 and 720 mL of 0.792 M aqueous Na3PO4 are reacted stoichiometrically according to the balanced equation, how many milliliters of 0.792 M aqueous Na3PO4 remain? Round your answer to 3 significant figures.

math
by how many order of magnitute is the speed of light greater than the average speed of grey sound? Rose Diamond when he set the hight gate track 710 m record of for this 47.43 sec in April 2003 710m/47.43s = close to 15 m/s. The speed of light is 3 x 10^8

Physics  Waves
he largest tension that can be sustained by a stretched string of linear mass density μ, even in principle, is given by τ = μc2, where c is the speed of light in vacuum. (This is an enormous value. The breaking tensions of all ordinary materials are

Chemistry
If 720 mL of 0.458 M aqueous Ba(OH)2 and 720 mL of 0.431 M aqueous HClO4 are reacted stoichiometrically according to the balanced equation, how many milliliters of 0.458 M aqueous Ba(OH)2 remain? Round your answer to 3 significant figures. Ba(OH)2(aq) +

physics essay question
If you fire a bullet through a block of wood, it will slow down as it passes through the block and emerge at less than its initial speed. If you shine light on a pane of glass, it will slow down as it travels through the glass, but reemerge at light speed.

PHYSICS!!
Light travels at about 0.75c in water. A)What's the wavelength in water of light whose wavelength in vacuum is 418nm

physics
An observer uses a 10 sided mirror to measure the speed of light. A clear image occurs every onetenth of a rotation when the mirror is rotating at 4.31x10^2 rev/s. The total path of the light pulse is 60 km, measured from the light source to the mirrors

physics
The largest tension that can be sustained by a stretched string of linear mass density μ, even in principle, is given by τ = μc2, where c is the speed of light in vacuum. (This is an enormous value. The breaking tensions of all ordinary materials are