calculations - photons (1 Viewer)

[melllyy]

i have this question where i need to calculate the number of photons per second striking a black body and i dont know how to find it. information you are given is that Power = 0.10mV, wavelength = 5.0 x 10^-7. You have to calculate the frequency of light and energy per photon of light - i have done these two, but i cant do the last part of the question which asks to calculate the number of photons per second striking the black body.
can anyone help me?

 

[Mountain.Dew]

i have this question where i need to calculate the number of photons per second striking a black body and i dont know how to find it. information you are given is that Power = 0.10mV, wavelength = 5.0 x 10^-7. You have to calculate the frequency of light and energy per photon of light - i have done these two, but i cant do the last part of the question which asks to calculate the number of photons per second striking the black body.
can anyone help me?

if uve got the frequency of light, then simply sub that into

E = hf, f = frequency, h = Planck's constant, E = total energy

then, u know that number of photons per second = total energy / energy per photon of light.

hope this helps, M.D.

 

[melllyy]

wow you made it so easy. thanks!