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Question

Physics Question on communication systems

If Ec=20  sin⁡ 105 πt{{E}_{c}}=20\,\,\sin \,{{10}^{5}}\,\pi t and Em=10sin⁡400πt{{E}_{m}}=10\sin 400\pi t it are carrier and modulating signals, the modulation index is

A

56%56\%

B

30%30\%

C

50%50\%

D

48%48\%

Answer

50%50\%

Explanation

Solution

m=EmEc=50m=\frac{{{E}_{m}}}{{{E}_{c}}}=50%