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  4. The wavelength of electromagnetic waves of frequency 5 × 1014 Hz is (in angstrom) is

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Q. The wavelength of electromagnetic waves of frequency $ 5 \times 10^{14}\, Hz $ is (in angstrom) is

J & K CETJ & K CET 2017Electromagnetic Waves

Solution:

$\upsilon=5\times10^{14}\,Hz$
For em wave : $c=3\times10^{8}m\,s^{-1}$
and $\lambda=\frac{c}{\upsilon}=\frac{3\times10^{8}}{5\times10^{14}}m$
$=6\times10^{-7}\,m$
$=6000\,\mathring{A}$