In amplitude modulation, a modulating signal of amplitude X V is superimposed on a carrier of amplitude Y V. In a second case the same modulating signal is superimposed on a carrier of amplitude 2Y V. The ratio of modulation indices μ₁:μ₂ is:
Options

Question

In amplitude modulation, a modulating signal of amplitude X V is superimposed on a carrier of amplitude Y V. In a second case the same modulating signal is superimposed on a carrier of amplitude 2Y V. The ratio of modulation indices μ₁:μ₂ is:

Options

G1 Physics · Accepted Answer

Modulation index: μ = Aₘ/A꜀ First case: μ₁ = X/Y Second case: μ₂ = X/(2Y) Therefore: μ₁/μ₂ = 2 So μ₁:μ₂ = 2:1. Hence option C.