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Sodium lamp emits yellow light of wavelength `5800 Å` the wave number of the light is

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Sodium lamp emits yellow light of wavelength `5800 Å` the wave number of the light is
A. `1.72xx10^(6)//m`
B. `17.2xx10^(8)//m`
C. `5.17xx10^(14)//s`
D. `17.2xx10^(7)//m`
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Correct Answer - A
Wave number `=1/lambda`
`=1/(5800xx10^(-10)m)=1.724xx10^(6)//m`
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