Why are microwaves used in radar?

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 are EM waves ?

MEDIUM

11th Maharashtra Board

IMPORTANT

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

How are EM waves produced?

EASY

11th Maharashtra Board

IMPORTANT

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

Can we produce a pure electric or magnetic wave in space? Why?

EASY

11th Maharashtra Board

IMPORTANT

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

Does an ordinary electric lamp emit EM waves?

EASY

11th Maharashtra Board

IMPORTANT

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

Why light waves travel in vacuum whereas sound wave cannot?

EASY

11th Maharashtra Board

IMPORTANT

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

What are ultraviolet rays? Give two uses.

EASY

11th Maharashtra Board

IMPORTANT

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

What are radio waves? Give its two uses.

EASY

11th Maharashtra Board

IMPORTANT

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

Name the most harmful radiation entering the Earth's atmosphere from the outer space.