MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Earn 100

Do compressions and rarefactions in sound wave travel in same directions or opposite directions ? Explain.

Important Questions on Sound

EASY
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
Does the frequency of sound waves depend on the medium in which it travels? How?
EASY
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
The frequency of the source of sound is 10 Hz. How many times does it vibrate in one minute?
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
Gently strike a hanging bell (temple bell) and try to listen to the sound produced by it with a stethoscope keeping it both at the bottom portion and top portion of the bell. Is the pitch and loudness of the sound the same at the two portions? Why?
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
During a thunderstorm, if you notice a 3 second delay between the flash of lightning and the sound of thunder. What is the approximate distance of the thunderstorm from you? (The speed of sound in the air=340 ms)
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
Two girls are playing on identical stringed instruments. The strings of both instruments are adjusted to give notes of the same pitch. Will the quality of the two notes be the same? Justify your answer.
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
What change, would you expect in the characteristic of a musical sound when we increase its frequency in one instance and amplitude in another instance?
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Activity-4>Q ●
Do hard surfaces reflect sound better than soft ones?
MEDIUM
9th Andhra Pradesh Board
IMPORTANT
Physical Science Class 9>Chapter 11 - Sound>Think and discuss>Q ●
What could be the reason for better reflection of sound by rough surfaces than polished surfaces?