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Sergei Voitovich · Answer 1 · 2019-03-23T15:51:05+0000

The relationship between wavelength
$\lambda$ , frequency f and speed of light c for an electromagnetic wave is

$\lambda= (c)/(f)$
Using the data of the problem, we find

$\lambda= (3\cdot 10^8 m/s )/(7.20 \cdot 10^(21) Hz)=4.17 \cdot 10^(-14) m$

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