Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0×10−10s.

Answer:- (i) The frequency of the light wave is

period1​=2.0×10−10s1​=5×109/s.

(ii) The wavelength of light wave is

νc​=5×109/s3×108m/s​=6.0×10−2m.

(iii) The wave number of light wave is

νˉ=λ1​=6.0×10−21​=16.66/m.