For signal, m(t) = 50cos(10 × 90t + 30 sin100t), the power dissipated by the 20Ω resistor is ________(a) 100W(b) 65W(c) 74.7W(d) 62.5WThe question was asked in a job interview.I'd like to ask this question from Coherent Detection of DSBSC Waves in division Double Sideband Suppressed Carrier Modulation of Analog Communications

For signal, m(t) = 50cos(10 × 90t + 30 sin100t), the power dissipated

1.	For signal, m(t) = 50cos(10 × 90t + 30 sin100t), the power dissipated by the 20Ω resistor is ________(a) 100W(b) 65W(c) 74.7W(d) 62.5WThe question was asked in a job interview.I'd like to ask this question from Coherent Detection of DSBSC Waves in division Double Sideband Suppressed Carrier Modulation of Analog Communications
Answer» The correct ANSWER is (d) 62.5W To explain: In angle modulation, the amplitude of carrier remains CONSTANT and thus power depends on amplitude only. On Comparing with the EQUATION, m(t) = ACOS(ωct + mf sinωmt). We have A = 50, dissipated power,

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