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Question

The expression for an AM voltage is
e=5(1+0.6cos100πt)cos5×106πt volt.. The frequency of audio signal is :

A
1000Hz
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B
5000Hz
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C
50Hz
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D
250Hz
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Solution

The correct option is C 50Hz
Comparing the given equation with the standard equation, e=Ec(1+macosωmt)cosωct
ωm=100π2π=50Hz

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