Calculate the wavelength, frequency and wave number of a light wave wh

1.	Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0 x 10-10 s.
Answer» T = 2.0 x 10^-10 s Frequency, v = 1/T = {1}/{2.0 x 10^-10} = 5 x 10⁹ s^-1 v = vλ i.e., 3 x 10⁸ = 5 x 10⁹ x λ λ = {3 x 10⁸}/{5 x 10⁹} = 6.0 x 10^-2 m Wave number, bar v = 1/λ = {1}/{6.0 x 10^-2} = 100/6 = 16.66 m^-1

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

Answer»

T = 2.0 x 10^-10 s

Frequency, v = 1/T = {1}/{2.0 x 10^-10} = 5 x 10⁹ s^-1

v = vλ

i.e., 3 x 10⁸ = 5 x 10⁹ x λ

λ = {3 x 10⁸}/{5 x 10⁹} = 6.0 x 10^-2 m

Wave number, bar v = 1/λ = {1}/{6.0 x 10^-2} = 100/6 = 16.66 m^-1