Home
Class 12
PHYSICS
When carrier wave of 2.5 MHz frequency i...

When carrier wave of 2.5 MHz frequency is amplitude modulated, the resulting AM wave has maximum of 15 V and minimum amplitude of 10 V. The modulation index is

A

0.3

B

0.2

C

0.1

D

0.4

Text Solution

Verified by Experts

The correct Answer is:
B
Molulation Index = `(V_(m))/(v_(c))= (((V_("max")-V_("min")))/(2))/( ((V_("max")+V_("min")))/(2))`
`= (15-10)/(15+10) xx 100%= 20%`
Promotional Banner

Similar Questions

Explore conceptually related problems

A single of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal is/are :-

A 100 MHz xarrier wave frequency is modulated by 10 kHz sinusoidal modulating signal. If the maximum frequency deviation is 50 kHz, find the modulation index.

In amplitude modulation determine the total maximum transmitted power, If the carrier output is 1 kW

A transverse sinusoidal wave of amplitude a , wavelength lambda and frequency f is travelling on a stretched string. The maximum speed of any point in the string is v//10 , where v is the speed of propagation of the wave. If a = 10^(-3)m and v = 10ms^(-1) , then lambda and f are given by

For one electromagnetic wave propagating along + Z axis frequency is 10^(15) Hz and amplitude of oscillations of electric field is 51 N/C. Find amplitude of oscillations of magnetic field and its rms value.

The displacement of the medium in a sound wave is given by the equation y_(1) = A cos(ax + bt) where A , a and b are positive constants. The wave is reflected by an obstacle situated at x = 0 . The intensity of the reflected wave is 0.64 times that of the incident wave. (a) What are the wavelength and frequency of incident wave? (b) Write the equation for the reflected wave. ( c ) In the resultant wave formed after reflection, find the maximum and minimum values of the particle speeds in the medium. (d) Express the resultant wave as a superposition of a standing wave and a travelling wave. What are the positions of the antinodes of the standing wave ? What is the direction of propagation of travelling wave?

A plane progressive wave of frequency 25 Hz, amplitude 2.5 xx 10^(-5) m and initial phase zero moves along the negative x-direction with a velocity of 300 m/s. A and B are two points 6 m apart on the line of propagation of the wave. At any instant the phase different between A and B is phi . The maximum difference in the displacements of particle at A and B is Delta

When two waves of amplitudes 3 unit and 5 unit superpose at some point, find ratio of maximum to minimum intensity.

Three simple harmonic waves , identical in frequency n and amplitude A moving in the same direction are superimposed in air in such a way , that the first , second and the third wave have the phase angles phi , phi + ( pi//2) and (phi + pi) , respectively at a given point P in the superposition Then as the waves progress , the superposition will result in