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Wave Optics

Question
CBSEENPH12039176

(a) Define the term 'intensity of radiation' in terms of photon picture of light.

(b) Two monochromatic beams, one red and the other blue, have the same intensity.

In which case:

(i) the number of photons per unit area per second is larger,

(ii) the maximum kinetic energy of the photoelectrons is more? Justify your answer.

Solution

a) The number of photons falling per unit area in unit time is defined as the intensity of radiation.

b)

i) Since, the two beams have the same intensity therefore, the number of photons emitted per unit are per unit time is the same.

ii) Maximum Kinetic energy of photoelectrons is given by, straight E straight space equals straight space hν straight space – straight space straight ϕ
We know that the frequency of blue beam is more than that of the red beam. Therefore, maximum Kinetic energy of the blue beam will be more.

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