Question 2.7 Calculate the wavelength, frequency and wave number of a light wave whose period is 2.0 × 10–10 s.
Class XI Structure of Atom Page 65
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we know,
frequency ( v ) = 1/ time period
here, time period = 2 × 10^-10 s
so, frequency ( v ) = 1/2 × 10^-10 = 5 × 10^9 Hz
wavelength ( λ ) = speed of light /frequency
wavelength ( λ ) = 3 × 10^8/5 × 10^9
= 6 × 10^-2 m
wavelength = 1/wavelength
= 1/6 × 10^-2 = 100/6 = 16.66 m^-1
frequency ( v ) = 1/ time period
here, time period = 2 × 10^-10 s
so, frequency ( v ) = 1/2 × 10^-10 = 5 × 10^9 Hz
wavelength ( λ ) = speed of light /frequency
wavelength ( λ ) = 3 × 10^8/5 × 10^9
= 6 × 10^-2 m
wavelength = 1/wavelength
= 1/6 × 10^-2 = 100/6 = 16.66 m^-1
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