Question

wavelength of a radiation emitted by a sodium lamp is 600nm. find the frequency?

Answer 1

Frequency of wave and wavelength is related to each other as per formula

$f = \frac{c}{\lambda}$

here

c = speed of light

$\lambda$ = wavelength = 600 nm

now plug in values in the above equation

$\nu = \frac{3*10^8}{600*10^{-9}}$

$\nu = 5*10^{14}Hz$

so the frequency of light is same as above.