The frequencies of two side bands in an AM wave are $640 kHz$ and $660 kHz$ respectively. What is the bandwidth required for amplitude modulation?

200 kHz

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30 kHz

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2 kHz

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20 kHz

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Solution

The correct option is D $20 kHz$
Given:
frequencies of side band $1, f_{1} = 640 Hz$
frequencies of side band $2, f_{2} = 660 Hz$

We know that
band width of AM $= f_{2} \sim f_{1}$

$= (660 - 640) kHz = 20 kHz$

Hence , option $(A)$ is correct.

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The frequencies of two side bands in an AM wave are $640 kHz$ and $660 kHz$ respectively. Find the frequencies of carrier and modulating signal. What is the bandwidth required for amplitude modulation

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The frequencies of two side bands in an AM wave are 640 kHz and 660 kHz respectively. What is the bandwidth required for amplitude modulation?

The correct option is D 20 kHzGiven: frequencies of side band 1,f1=640 Hz frequencies of side band 2,f2=660 Hz We know that band width of AM =f2∼f1 =(660−640) kHz=20 kHz Hence , option (A) is correct.

The frequencies of two side bands in an AM wave are $640 kHz$ and $660 kHz$ respectively. What is the bandwidth required for amplitude modulation?

The correct option is D $20 kHz$
Given:
frequencies of side band $1, f_{1} = 640 Hz$
frequencies of side band $2, f_{2} = 660 Hz$

We know that
band width of AM $= f_{2} \sim f_{1}$

$= (660 - 640) kHz = 20 kHz$

Hence , option $(A)$ is correct.