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In amplitude modulation, sinusoidal carrier frequency used is denoted by ω c and the signal frequency is denoted ω m . The bandwidth ( Δω m ) of the signal is such that Δω m << ω c . Which of the following frequencies is not contained in the modulated wave?

1. ω m
2. ω c
3. ω m + ω c
4. ω c – ω m

Correct answer: ω m

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