Question

calculate wavenumber of radiation having frequency 4 *10^14 Hz

Answer 1

Given that Frequency of radiation = 4 *10^14 Hz = 4 *10^14 s^-1

We know that required formula is:

Wave length = Speed / Frequency

Wave number = 1/Wavelength

Therefore Wave number = Frequency / speed

Speed of light is 3 * 10^8 m/s

Wave number = 4 *10^14 / 3 * 10^8 = 1.33 * 10^6 m^-1

Answer is 1.33 * 10^6 metre inverse

Answer 2

wave number =1/wavelength

wave number =frequency/speed

speed of light =3×10^ 8

wave number =4×10 ^14/3×10^8

=1.33×10^6m-1 answer

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