What is the wave number for light with a wavelength of 4000 nm?

2.5 \times 10^{- 4}

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5 \times 10^{16}

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7.5 \times 10^{4}

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8.5 \times 10^{4}

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Solution

The correct option is A $2.5 \times 10^{- 4}$ cm
Ware Number $= \frac{1}{w a r e l e n g t h}$

$= \frac{1}{4000} = 2.5 \times 10^{- 4} c m$

Hence the correct option is A.

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