Question

Yellow light is emitted from a solid lamp has a wavelength of 580 nm. Calculate the frequency and wave number of the yellow light.

Answer 1

Given wavelength = 580 nm
​= 580 $\times$ 10 ^-9 m
Frequency = c / $\lambda$
Speed of light = 3$\times$ 10⁸ m/s
= 3$\times$ 10 ⁸ / 580 ​ $\times$ 10 ^-9 m
= 0.05172 $\times$ 10 ¹⁶ s^-1
wavenumber = 1/ ​$\lambda$
= 1/​580 $\times$ 10 ^-9 m
= 0.00172$\times$ 10 ⁹ m^-1