Question

Calculate the wavelength, frequency and wave number of a light wave whose period is2.0×10-10s

Answer 1

Answer:

Frequency = 5 * 10^9s^-1

wavelength (λ) = 6 * 10^-2m

wave number = 16.66m

Explanation:

(i) The frequency of the light wave is

1/Period = 1/2 * 10^-10s = 0.5 * 10^10s^-1

= 5 * 10^9s^-1 .

(ii) The wavelength (λ) of light wave is

Speed/Frequency =

3 * 10^8/5 * 10^9s^-1 = 0.6 * 10^-1 s

= 6 * 10^-2m .

(iii) The wave number of light wave is

1/lamda(λ) = 1/6 * 10^-2 =

0.16666 * 10^2 = 16.66m

HOPE YOU HAD UNDERSTOOD