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The wavelength of light having wave number 400cm-1 is

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By Expert Faculty of Sri Chaitanya
a
2.5μm
b
250μm
c
25μm
d
25nm
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detailed solution

Correct option is B

The relation between wave number and wavelength is

ϑ=1λ

λ=1ϑ

λ=14000cm-1=250×10-6m

250μm; since 1μm=10-6m


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