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Question

Calculate the frequency of a wave with wavelength 4×107 nm .

A
7.5×109 s1
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B
7.5×106 s1
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C
2.5×109 s1
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D
2.5×106 s1
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Solution

The correct option is A 7.5×109 s1
Given,
Wavelength (λ)=4×107 nm=4×102 m
Again we know,
c=λv, where c is velocity of light.
Therefore,
frequency (v)=cλ=3×108 m s14×102 m =7.5×109 s1

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