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Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0 x 10-10 s.

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T = 2.0 x 10-10 s

Frequency, v = 1/T = {1}/{2.0 x 10-10} = 5 x 109 s-1

v = vλ

i.e., 3 x 108 = 5 x 109 x λ

λ = {3 x 108}/{5 x 109} = 6.0 x 10-2 m

Wave number, bar v = 1/λ = {1}/{6.0 x 10-2} = 100/6 = 16.66 m-1

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