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The wavelength of light having wave number $400 {cm}^{- 1} is$

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2.5 μm

250 μm

25 μm

25 nm

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Correct option is B

The relation between wave number and wavelength is

$ϑ$ $= \frac{1}{λ}$

$\Rightarrow λ = \frac{1}{ϑ}$

$λ = \frac{1}{4000 {cm}^{- 1}} = 250 \times 10^{- 6} m$

$∴ 250 μm; since 1 μm = 10^{- 6} m$

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

Unlock the full solution & master the concept.

Ready to Test Your Skills?

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The wavelength of light having wave number $400 {cm}^{- 1} is$