Q.

An AM wave is given by v=5001+0.5sin12560t sin5.26 x 105t. The modulating frequency is

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a

2.0 kHz

b

1.0 kHz

c

12.5 kHz

d

50 kHz

answer is A.

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Detailed Solution

Given with standard form Cm(t)=Ac1+μsin⁡ωmtsin⁡ωct∴ωm=2πfm=12560⇒fm=125602π=2kHz
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