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

Question 2.7: Calculate the wavelength, frequency and wave number of a light wave whose period is
2.0 × 10^-10 s.
Answer
Frequency (ν) of light


Wavelength (λ) of light

Where,
c = velocity of light in vacuum = 3×10⁸ m/s
Substituting the value in the given expression of λ:

Wave number of light