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11th Maharashtra Board
IMPORTANT
Earn 100

By which mechanism heat is lost by hot bodies ? 

Important Questions on Electromagnetic Waves and Communication System

EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
The EM wave emitted by the Sun and responsible for heating the Earth's atmosphere due to green house effect is
EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
Earth's atmosphere is richest in 
EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
How does the frequency of a beam of ultraviolet light change when it travels from air into glass?
EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
The direction of EM wave is given by 
EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
The maximum distance upto which TV transmission from a TV tower of height h can  be received is proportional to
MEDIUM
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1
The waves used by artificial satellites for communication purposes are
EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 1

If a TV telecast is to cover a radius of 640 km, what should be the height of transmitting antenna?

EASY
11th Maharashtra Board
IMPORTANT
Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2
State two characteristics of an EM wave.