Calculate the wavelength, frequency, and wave number of a light wave whose period is $2.0 \times 10^{- 10} s$ .

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$T = 2.0 \times 10^{- 10} s$
Frequency, $v = \frac{1}{T} = \frac{1}{2.0 \times 10^{- 10}} = 5 \times 10^{9} s^{- 1}$
$v = \frac{c}{λ}, c = ¯ v λ$
$3 \times 10^{8} = 5 \times 10^{9} \times λ$
$λ = \frac{3 \times 10^{8}}{5 \times 10^{9}} = 6.0 \times 10^{- 2} m$
Wave number, $¯ v = \frac{1}{λ} = \frac{1}{6.0 \times 10^{- 2}} = \frac{100}{6} = 16.66 m^{- 1}$

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Updated on:21/07/2023

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