Answer to Question #3092 in Physical Chemistry for Sandeepan dhar chowdhury

Question

Q. Find energy of each of the photons which:-
(i) correspond to light of frequency 3 x 10^15 Hz.
(ii) Have wavelength of 0.50A

Answer 1

The energy of photon can be written as
E = hν/c = hc/ λ, where h -is a Planck constant, c - the speed of the light, ν - the frequency, λ - the wavelength.
(i) E = 6.62 x 10^-34 * 3 x 10¹⁵ / 3 x 10⁸ = 6.62 x 10^-27 J.
(ii) E = 6.62 x 10^-34 *3 x 10⁸ /0.5 x 10^-10 = 3.972 x 10^-15 J.