The energy of an electromagnetic radiation is | vedclass

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(D) The energy of radiation is given by the formula: $E = h 
u = \frac{hc}{\lambda} = hc \bar{
u}$, where $\bar{
u}$ is the wave number.Rearranging

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(D) The energy of radiation is given by the formula: $E = h 
u = \frac{hc}{\lambda} = hc \bar{
u}$, where $\bar{
u}$ is the wave number.Rearranging for the wave number: $\bar{
u} = \frac{E}{hc}$.Substituting the given values: $\bar{
u} = \frac{19.875 	imes 10^{-13} \ erg}{6.625 	imes 10^{-27} \ erg \ sec 	imes 3 	imes 10^{10} \ cm \ sec^{-1}}$.$\bar{
u} = \frac{19.875 	imes 10^{-13}}{19.875 	imes 10^{-17}} = 10^4 \ cm^{-1}$.

The energy of an electromagnetic radiation is $19.875 \times 10^{-13} \ erg$. What is its 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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