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Question

The frequency of a wave of light is 12×1014s1. The wave number associated with this light is

A
5×107m
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B
4×108cm1
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C
2×107m1
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D
4×104cm1
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Solution

The correct option is D 4×104cm1
  • We know that, λ=cν
λ=3×10812×1014=14×106m
  • Wave number (¯¯¯ν) is the reciprocal of wavelength. That is, ¯¯¯ν=1λ
¯¯¯ν=4×106m1=4×104cm1

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