Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0 × 10–10 s.
Given:
Period, T = 2.0 × 10–10 s
Frequency, v = [1] / T
= [1] / [2.0 × 10–10]
= 5.0 × 109 Hz
We know the following basic relation,
Speed of Light = [Frequency] × [Wavelength]
We know speed of light = 3×108 m/s
Wavelength, λ = [3×108] / [5.0 × 109]
= 0.06 m
Wave Number = [1] / [λ]
= [1/0.06]
= 16. 667 m-1
Therefore, the frequency of wave is 5.0 × 109 Hz and its wavelength is 0.06 m and its wave number 16. 667 m-1