Question

light of wavelength 550 nm in air is found to travel at 1.96x108 m/s in a certain liquid. determine the frequency of the light in the liquid.

Answer 1

359 nm

v = f x λ → f = v/λ = c/λ

*frequency of light is the same in both air & liquid.

f = (3 x 10⁸)/(550 x 10⁻⁹) = (1.96 x 10⁸ m/s)/λ

λ = 359.33 x 10⁻⁹ m = 359 nm