The message signal contain three frequencies 5 kHz, 10 kHz,

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The message signal contain three frequencies 5 kHz, 10 kHz, 20 kHz respectively. The bandwidth of the AM signal is—

1. 40kHz
2. 10 kHz
3. 20 kHz
4. 30 kHz

Correct Option: A

BW = 2x maximum frequency of the modulating signal.
= 2 × 20 = 40 kHz