Login/Sign Up
The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?
The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?
CBSE | Class 12 | Communication Systems | NCERT Exemplar | Physics
The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?

Answer:

The modulation index is the ratio of the change in carrier wave amplitude to the original carrier wave amplitude.

according to the question, the maximum amplitude of AM wave is

 Amax = Ac + Am = 15 V

and the minimum amplitude of the AM wave is

Amin = Ac – Am = 3V

Expression for the modulation index is as follows:

m = modulation index = Am/Ac

m = 2/3

i

More Material