What is demodulation?

Important Questions on Electromagnetic Waves and Communication System

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

What type of modulation is required for television broadcast?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

How does the effective power radiated by an antenna vary with wavelength?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Why should broadcasting programs use different frequencies?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Explain the necessity of a carrier wave in communication.

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Why does amplitude modulation give noisy reception?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Explain why is modulation needed.

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in vacuum is $3 \times$ ${10}^{8 }$ $m/s$

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Calculate the wavelength in nm of an X-ray wave of frequency $2.0 \times {10}^{18} Hz$