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in Dual Nature of Radiation and Matter by (48.5k points)
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Monochromatic light of frequency 6 x 1014 Hz is produced by a laser. The power emitted is 2 x 10-3 w

(i) What is the energy of each photon in the light? 

(ii) How many photons per second, on the average, are emitted by the source?

1 Answer

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by (48.1k points)
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(i) Energy of each photon, 

E = h\(v\) = 6.6 x 10-34 x 6 x 1014 

E = 3.98 x 10-19

(ii) If N is the number of photons emitted per second by the source, then 

Power transmitted in the beam = N x energy of each photon P = N

N = 5 x 1015 Photons per second.

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