Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking
Umakant Kondapure Physics Solutions for Exercise - Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking
Attempt the practice questions on Chapter 14: Communication Systems, Exercise 3: Competitive Thinking with hints and solutions to strengthen your understanding. MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET solutions are prepared by Experienced Embibe Experts.
Questions from Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking with Hints & Solutions
The maximum frequency of transmitted radio waves above which the radio waves are no longer reflected back by ionosphere is (),

For sky wave propagation of a signal, what should be the minimum electron density in ionosphere?

A sky wave with a frequency is incident on -region of earth's atmosphere at . The angle of refraction is (electron density for -region is ),

A transmitting antenna of height $h$ and the receiving antenna of height are separated by a distance of of satisfactory communication in line-of-sight mode. Then, the value of $h$ is (given, radius of earth is ),

In optical communication system operating at , only $2 \%$ of the source frequency is available for TV transmission having a bandwidth of . The number of TV channels which can be transmitted is,

Assertion: Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave propagation.
Reason: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

A message signal of frequency $\omega_{\mathrm{m}}$ is superposed on carrier wave of frequency $\omega_{\mathrm{c}}$ to get an amplitude modulated wave (AM). Then, one of the angular frequencies of the AM wave is,

Assertion: A portable AM radio set must be kept horizontal to receive the signals properly.
Reason: Radio waves are polarised electromagnetic waves.
