Question

caliculate the frequency and wave number with wave length 480nm

Answer 1

wave number =1/wavelength.... 1/489×10^-9m = .00204×10^9 cm^-1
frequency=c\wavelength =3×10^8÷489×10^-9 = .00613×10^17 Hz

Answer 2

Frequency = c/λ
= (3 * 10^8) / (480 * 10^-9)
= 6.25 * 10^14 Hz

Wavenumber = 1/λ
= 1/(480 * 10^-9)
= 2.083 * 10^6 m^-1