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1. A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be
(A): 1015 kHz and 985 kHz
(B): 1030 kHz and 970 kHz
(C): 13 kHz and 17 kHz
(D): 14 kHz and 16 kHz
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