Question
The angular frequency of emf wave will be $($in $\frac{\text{rad}}{\text{s}})$

Answer

Frequency of wave $f = 40 \times 106 Hz$
Angular frequency, $\omega=2\pi\text{v}$
$\omega=2\pi\times40\times10^6$
$\Rightarrow\omega=8\pi\times10^7\frac{\text{rad}}{\text{s}}$

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