MEDIUM
7th ICSE
IMPORTANT
Earn 100

Explain compression and rarefaction with diagram.

Important Questions on Sound

HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 4
How can the pitch of sound produced in a piano be changed ?
HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 5
Explain why you can predict the arrival of a train by placing your ear on the rails without seeing it.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 6
Write the approximate speed of sound in air.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 6
Write the approximate speed of sound in water .
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 6
Write the approximate speed of sound in steel.
HARD
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 7
During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why ?
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 8
What is an echo? How is echo formed?
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Physics>Chapter 6 - Sound>EXERCISES>Q 8

What is the minimum distance in air required from a sound reflecting surface to hear an echo(at 20∘C)? Speed of sound in air at 20∘C=343 m/s.