The power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 w = 1 j s-1). a 300-mw krypton laser produces a beam of red light with a wavelength of 676.4 nm (6.764×10-7 m). (a) calculate the energy carried by each photon. (b) calculate the number of photons emitted by the laser per second.

Explanation:

It is given that,

Wavelength of red light,

Power of the laser,

(a) The energy carried by each photon is given by :

(b) Let n is the number of photons emitted by the laser per second. It can be calculated as :

Hence, this is the required solution.    

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explanation:

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