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Questions  

If a message signal of frequency  fm is amplitude modulated with a carrier signal of frequency fc and radiated through an antenna, the wavelength of the corresponding  signal in air is:
 

a
cfc
b
cfm
c
cfc+fm
d
cfc−fm

detailed solution

Correct option is A

Wave transmitted at carrier frequency =λ=cfrequencies of carrier wave⇒λ=cfc

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A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. The side bands are 1010 kHz and______________kHz.


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