Question

Calculate the wavelength frequency and waves number of a light whose time period is 3×10^-10s

Answer 1

Given,

T= 3x10^(-10)s

frequency, f = 1/T = 1/(3x10^-10) = 3.3x10^9 Hz

Wavelength, λ = c/f [where , C = speed of light ]

λ = 3x10^8/3.3x10^9 = 0.09 m

Wavenumber, 1/ λ = 1/0.09

or,1/ λ = 11.1m^-1.