Three monochromatic electromagnetic waves P, Q and R propagate in vacuum

PHYSICS · Subjective · CBSE · Physics · Waves · Waves

Problem

Three monochromatic electromagnetic waves P, Q and R propagate in vacuum. Their angular frequencies are in the ratio

\omega_P : \omega_Q : \omega_R = 1 : 2 : 4

. (a) Arrange the waves in ascending order of their wavelengths. (b) The wavelength of Q is

300\,\text{nm}

. Find the wavelength of R. (c) Rank the waves in ascending order of their wave numbers

k

and justify your answer.