a. 5W
A standard FM signal is represented by
v(t) = Ac cos(2πfct + kfsin2πfmt)
Ac = carrier amplitude fc = carrier frequency
kf = modulation index
fm = modulating frequency
kf = frequency deviation/modulating frequency
the power dissipated across 20Ω resistor is given by
Vrms 2/R
=(20/√2)2/R= 5W
