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Question

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


A

5 × 10-7m

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B

4 × 10-8 cm-1

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C

2 × 10-7 m-1

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D

4 × 104 cm-1

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Solution

The correct option is D

4 × 104 cm-1


Frequency v = 12 × 1014s1 and velocity of light

c = 3 × 1010 cms1. We know that the wave number ¯¯¯v = vc = 12 × 10143 × 1010 = 4 × 104 cm1


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