Question

Yellow light emitted from a sodium lamp has a wavelength $\left(\lambda \right)$ of 580 nm. Calculate the frequency $\left(\nu \right)$, wave number and energy of yellow light photon.

Answer 1

Frequency $\left(\nu \right)=\frac{c}{\lambda }=\frac{3.0\times {10}^8}{580\times {10}^{-9}}=5.17\times {10}^{14}$ Hz

Wave number $=\overline{\nu }=\frac{1}{\lambda }=\frac{1}{580\times {10}^{-9}}=1.724\times {10}^6{m}^{-1}$

Energy, $E=h\nu =6.626\times {10}^{-34}\times 5.17\times {10}^{14}$

$=34.25\times {10}^{-20}$ J/photon