question_answer 55)

  There are two sources of light, each emitting with a power of 100 W. One emits X-rays of wavelength 1 nm and the other visible light at 500 nm. Find the ratio of number of photons of X-rays to the photons of visible light of the given wavelength?

Answer:

                  Here, Let =no. of  photons of X-rays and visible light emitted from the two sources          or           or