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Q.

The wavelength of light having wave number $5000 c m^{- 1}$ is $x \times 10^{- 4} c m$ . What is ‘ $x$ ’?

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answer is 2.

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Detailed Solution

$\bar{ϑ} = 5000 c m^{- 1}, λ = ?$

$λ = \frac{1}{\bar{ϑ}} = \frac{1}{5} \times 10^{- 3} = 0.2 \times 10^{- 3} = 2 \times 10^{- 4} c m$

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