HARD
7th ICSE
IMPORTANT
Earn 100

What minimum distance is required between the source of the sound and the reflecting surface to hear an echo? Give reason.

Important Questions on Sound

MEDIUM
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 6 - Sound>TEST YOURSELF>Q 41
List four substances which are good absorbers of sound.
HARD
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 6 - Sound>TEST YOURSELF>Q 42
List the measures that you will take when designing a sound-proof room.
HARD
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 6 - Sound>TEST YOURSELF>Q 1
A boy fires a gun and another boy at a distance of 1020 m hears the sound of firing the gun 3 s after seeing its smoke. Find the speed of sound.
HARD
7th ICSE
IMPORTANT
Concise PHYSICS Middle School 7>Chapter 6 - Sound>TEST YOURSELF>Q 2
A boy on a hill A fires a gun. The other boy on hill B hears the sound after 4 s. If the speed of sound is 330 m/s, find the distance between the two hills.