Question

Yellow light emitted from sodium vapour lamp has wavelength $580nm$ .Calculate wavelength frequency and time period of radiation.

Answer 1

$\lambda =580nm$

frequency = $\nu =\frac{c}{\lambda }$

$=\frac{3\times {10}^8}{580\times {10}^{-9}}=5.17\times {10}^{14}$ Hz

Time period = $T=\frac{1}{\nu }$

$=1.96\times {10}^{-15}sec$