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Standard XII

Physics

Sinusoidal ca...

Question

Sinusoidal carrier voltage of frequency 1.5 $M H z$ and amplitude 50 $V$ is amplitude modulated by sinusoidal voltage of frequency 10 $K H z$ producing 50% modulation . The lower and upper side-band frequencies in $k H z$ are:

1490, 1510

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15410, 1490

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$\frac{1}{1490}, \frac{1}{1510}$

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$\frac{1}{1490}, \frac{1}{1520}$

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Solution

The correct option is A
1490, 1510

Here , $f_{c} = 1.5 M H z = 1500 k H z, f_{m} = 10 k H z$

Therefore Low side band frequency

$f_{c} - f_{m} = 1500 k H z - 10 k H z = 1490 k H z$

Upper side band frequency
$f_{c} + f_{m} = 1500 k H z + 10 k H z = 1510 k H z$

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Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 KHz producing 50% modulation . The lower and upper side-band frequencies in kHz are:

The correct option is A 1490, 1510 Here ,fc=1.5 MHz=1500 kHz,fm=10 kHz Therefore Low side band frequency fc−fm=1500kHz−10kHz=1490kHz Upper side band frequency fc+fm=1500kHz+10kHz=1510kHz

Sinusoidal carrier voltage of frequency 1.5 $M H z$ and amplitude 50 $V$ is amplitude modulated by sinusoidal voltage of frequency 10 $K H z$ producing 50% modulation . The lower and upper side-band frequencies in $k H z$ are:

The correct option is A
1490, 1510

Here , $f_{c} = 1.5 M H z = 1500 k H z, f_{m} = 10 k H z$

Therefore Low side band frequency

$f_{c} - f_{m} = 1500 k H z - 10 k H z = 1490 k H z$

Upper side band frequency
$f_{c} + f_{m} = 1500 k H z + 10 k H z = 1510 k H z$