Home
Class 12
PHYSICS
In an amplitude modulator circuit, the c...

In an amplitude modulator circuit, the carrier wave is given by, `C(t)=4sin (20000pit)` while modulating signal is given by, `m(t)=2 sin (2000pit)`. . The values of modulation index and lower side band frequency are:

A

0.3 and 9 kHZ

B

0.5 and 10 kHz

C

0.4 and 10 kHz

D

0.5 and 9 kHz

Text Solution

Verified by Experts

The correct Answer is:
D
L.S.B `=omega_(c)-omega_(m)=(20000-2000)pi=18000pi` rad/s
So `(18000pi)/(2pi)=9000Hz`
Modulation index `=(A_(m))/(A_(c))=0.5`
Promotional Banner

Similar Questions

Explore conceptually related problems

In an amplitude modulator circuit the carrier wave is given by C(t) = 4 sin(2 pi × 10^7 t) while modulating signal is given by m(t) = 2 sin(2 pi × 10^5 t) . Then the bandwidth of the broadcast signal will be

The carrier wave of a signal is given by C(t) = 3sin (8pit) volt. The modulating signal is a square wave as shown. Find its modulation index.

The carrier wave is represented by C(t) = 5 sin (10 pi t) volt A modulating signal is a square wave as shown in figure. Determine modulation index.

If A_m and A_c are the amplitudes of modulating signal and carrier wave respectively, then modulation index is given by

The amplitude modulated current is given by i=125[1+0.6sin2900t]sin10^(6)t . The depth of modulation is

In amplitude modulation carrier wave is C=4 sin 2000t and message wave M=2 sin 200t , Find out modulation index.

The amplitude modulated current is given by i=70[1+0.06sin2900t]sin10^(6)t . The depth of modulation is

A modulated signal is represented as x(1) = 6 sin 1250 t + sin 10^(8) t then the mudulating index is

In an amplitude modulation with modulation index 0.5 the ratio of the carrier wave to that of side band in the modulated wave is

In amplitude modulation, the message signal V_(m)(t)=10sin(2pixx10^(5)t) volts and Carrier signal V_(C )(t)=20sin(2pixx10^(7)t) volts The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is alpha KHz. The value of alpha is