Question

The energy of photon is given by E=hc/lambda if lambda = 4×10^-7m the energy of photon is

Answer 1

Photons always move with the speed of light. Photons have no mass, but they have energy E = hf = hc/λ. Here h = 6.626*10-34 Js is a universal constant called Planck's constant. The energy of each photon is inversely proportional to the wavelength of the associated EM wave.