A1 mw laser beam is incident onto a detector. determine the fractional fluctuation in number of photons intercepted by the detector in a time interval t 1 us for photons with energy (a) e1 10 me; (b) ez 10 ev.

(a)

(b)

Explanation:

Given that , the power of the laser beam is,

and time is given is,

Now the energy formula for the laser beam is,

Now,

(a) The value of energy is given,

Now the no of photons's fraction fluctuation is,

Therefore the no of photons is .

(b)The value of energy is given,

Now the no of photons's fraction fluctuation is,

Therefore the no of photons is.

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