Calculating Number of photons

[Lusin_Yengibaryan_3B]

How would we go about calculating the number of photons required for a liquid to absorb some amount of Joules of heat if we are only given wavelength and the part of the electromagnetic spectrum to which it belongs?

[Nick Pascua 2L]

Hello,

I believe if you use the equation E=hv and c=(lambda)v, then you can calculate E (which stands for the Energy per photon) by solving for v then using it in the E=hv equation. Since E stands for the Energy per photon, does it give you information about total energy (usually represented as a form of Watts)? Because I know that the total energy divided by the energy of one photon will give you the number of photons. If that's all it gives, then I'm not really sure.

I hope that somewhat helps!

[Madison Muggeo 3H]

A UA described it as in the change in E=hv, the units for change in E are J/photon. To find the number of photons you divide the total energy by the J/photon and the Joules cancel out and you are left with your answer in # of photons.