Amplitude modulated wave is represented by V _ AM =10 [1+0.4 (2 1… - Vidyadip

MCQ

Amplitude modulated wave is represented by

$V _{ AM }=10\left[1+0.4 \cos \left(2 \pi \times 10^{4} t \right)\right] \cos \left(2 \pi \times 10^{7} t \right) \text {. }$

The total bandwidth of the amplitude modulated wave is

A
$10\,kHz$
B
$20\,MHz$
✓
$20\,kHz$
D
$10\,MHz$

✓

Answer

Correct option: C.

$20\,kHz$

c
Bandwidth $=2 f _{ m }$

$=2 \times 10^{4} \,Hz =20 \times 10^{3} \,Hz$

$=20 \,kHz$

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