Amplitude modulated wave is represented by \[ \mathrm{V}_{\mathrm{AM}}=10\left[1+0.4 \cos \left(...

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Amplitude modulated wave is represented by
\[
\mathrm{V}_{\mathrm{AM}}=10\left[1+0.4 \cos \left(2 \pi \times 10^{4} \mathrm{t}\right)\right] \cos \left(2 \pi \times 10^{4} \mathrm{t}\right) \text {. }
\]
The total bandwidth of the amplitude modulated wave is
(a) \( 10 \mathrm{kHz} \)
(b) \( 20 \mathrm{MHz} \)
(c) \( 20 \mathrm{kHz} \)
(d) \( 10 \mathrm{MHz} \)
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