0
2
A photon with energy 3.0 x 10-19 J
A photon with wavelength 525 nm
A photon with frequency 7.6 x 1014 Hz
A photon with frequency 2 x 1015 Hz
Photon Energy E=hf = hc/w thus wavelength w= hc/E or the wavelength is hc divided by the energy of the photon or w= .2 e-24 Joule meter/Photon Energy.
a photon is a photon is a photon
mass of the proton is 0.
Answer 2
But the question asked about photons, not protons. The mass of a photon is also 0, though the mass of a proton is not!