EASY
9th CBSE
IMPORTANT
Earn 100

Can transverse waves travel in glasses?

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>CHAPTER EXERCISE>Q 22
At any instant a compression is formed at a point. After how much time A rarefaction can be produced?
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>CHAPTER EXERCISE>Q 22
At any instant a compression is formed at a point. After how much time another compression will be formed at the same point?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>CHAPTER EXERCISE>Q 23
State diagrammatically laws of reflections of sound and explain three applications based on these laws.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>CHAPTER EXERCISE>Q 24
Draw a labelled diagram, of human ear and discuss the function of its parts and its working.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>Challengers*>Q 1
A sound wave of wavelength 0.332 m has a time period of 10-3 s. If the period is decreased to 10-4 s, what will be the wavelength of new wave?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>Challengers*>Q 2
A person standing between two vertical cliffs and 640m away from the nearest cliff shouted. He heard the first echo after 4 seconds and the second echo 3seconds later. What is the distance between the cliffs?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>Challengers*>Q 3
A radar signal is reflected by an aeroplane and is received in 2×10-5 s after it was sent. If the speed of these waves is 3×108 m s-1 how far is the aeroplane?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 12 - Sound>Challengers*>Q 4

A disused railway line has a length of 300 m . A man puts his ear against one end of the rail and another man hits the other end with a metal hammer. Sound travels at 5000 m s-1 in steel. The time it takes for the sound to travel along the rail is: