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Q.

Photons of wavelength 660nm are emitted from a 60  watt lamp. What is the number of photons emitted per second?

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a

2×1020

b

2×1018

c

2×1016

d

2×1022

answer is C.

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Detailed Solution

Wavelength λ=660nm=660×109m

Power P=60watts

Planks constant h=6.62×1034J

Velocity of light C=3×108ms-1

Number of photon per second nt=?

  nt=hc              (P=nthcλ)

=60×660×1096.62×1034×3×108

=2×1020

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