1 Answer

Kostikas · Answer 1 · 2019-07-19T01:42:10+0000

The relationship between wavelength, frequency and speed of an electromagnetic wave is

$\lambda= (c)/(f)$
where

$\lambda$ is the wavelength of the wave
c is the speed of light
f is the wave's frequency

The wave in this problem has frequency
$f=6.90 \cdot 10^(21) Hz$ , so its wavelength is

$\lambda= (c)/(f)= (3 \cdot 10^8 m/s)/(6.90 \cdot 10^(21) Hz)=4.35 \cdot 10^(-14) m$

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