EASY
9th CBSE
IMPORTANT
Earn 100

What is the frequency range of hearing in humans?

Important Questions on Sound

EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Short Answer Type Questions>Q 59
Which of the following sound frequencies cannot be heard by a human ear?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Short Answer Type Questions>Q 60
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 ms calculate the distance of the reflecting surface. 
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Short Answer Type Questions>Q 61
The speed sound in water is 1500 metres per of second. How far away from an under-sea rock should a deep-sea diver be so that he can hear his own echo?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Long Answer Type Questions>Q 62
What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Long Answer Type Questions>Q 62
Name any two objects which are good reflectors of sound.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Long Answer Type Questions>Q 62
State the laws of reflection of sound.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Long Answer Type Questions>Q 63
What is an echo? How is echo formed?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 5 - Sound>Long Answer Type Questions>Q 63
What is the minimum distance in the air required from a sound-reflecting surface to hear an echo (at 20 °C)?