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The energy of an electromagnetic radiation is $19.875 \times 10^{- 13} ergs$ ergs. What is the wave number in ${cm}^{- 1}$ ?
$[h = 6.625 \times 10^{- 27} erg . \sec; c = 3 \times 10^{10} cm . \sec^{- 1}]$

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1000

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answer is D.

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Detailed Solution

large bar v = frac{E}{{hc}} = frac{{19.875 times {{10}^{ - 13}}ergs}}{{left( {6.625 times {{10}^{ - 27}}erg.sec } right)left( {3 times {{10}^{10}}cm/s} right)}}

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