MEDIUM
9th CBSE
IMPORTANT
Earn 100

What is SONAR? Write the full form of SONAR. Explain its use.

Important Questions on Sound

HARD
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 3
Discuss the structure of human ear from auditory aspect.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 4
What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 4
Name any two objects which are good reflectors of sound.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 4
State the laws of reflection of sound.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 5
What is echo? How is echo formed?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 5

What is the minimum distance in air required from a sound reflecting to hear an echo (at 20°C).

MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 5
A man standing 825 m away from a cliff (steep rock) fires a gun. After how long will he hear its echo? (Take speed of sound = 330 m/s).
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 6

Define the following terms:

(a) Echolocation

(b) Echocardiography, and

(c) Ultrasonography.