How many photons are in one joule?
I have 200hz * 1/s/Hz * 6.63*10^-34 J*S/ Photon = 1.326*10^-31 J/photon
The answer in the back of the book says 1.326*10^-19 J
Answer:
to determine the photons in 1 joule, you'll need to determine the energy of 1 photon:
E = h x frequency = 6.63 x 10^-34 Js x 200 s^-1 = 1.326 J/photon
so you did that part right!
but the question is asking for the photons in 1 joule. so:
1 photon / (1.326 x 10^-31 J) = 7.54 x 10 ^30 photons / J
To get 1 joule out of a 488 nm laser you need 2.45 x 1018 photons.
One joule is the work done, or energy expended, by a force of one newton moving an object one meter along the direction of the force.
http://en.wikipedia.org/wiki/joule...
I can see electron volt involved in one joule, But I am not sure how it is related to a photon. http://en.wikipedia.org/wiki/photons...
Hope this answer helps. Best of luck.
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