Question

how many photons are produced in a laser pulse of 0.755 J at 513nm?

Answer 1

first find how much energy 1 photon of that wavelength has, using plancks equation:

\(E_{photon}=\dfrac{h*c}{\lambda}\)

then divide the total energy (0.755 J) by the energy of 1 photon (that you found).

Answer 2

Please give me the equation!

Answer 3

i did, maybe you can't see latex.

it's E = h*c/wavelength

c =speed of light
h=plancks constant

Answer 4

Yeah...i got it now thanks!

Answer 5

no probs