The wavelength (λ) of a spectral line of caesium is 460 nm. Calculate the frequency of the line.
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Explanation:
λ= 460 x 10^-9 m
λ x v = c
therefore,
frequency = c/λ
= 3 x 10^8 / 460 x 10^-9
= 6.52 x 10^14 Hz
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