MEDIUM
9th CBSE
IMPORTANT
Earn 100

A sound is producing 1500 sound waves in 3 seconds. If the distance covered by a compression and an adjacent rarefaction be 68 cm, calculate:
(i) frequency (ii) wavelength (iii) velocity of the sound wave

Important Questions on Sound

MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 1
A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four
complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the
string:
(a) What is their wavelength?
(b) What is their frequency?
(c) What is their speed?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 2
A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound
producing body to the man. Which medium could be the one:
(a) having no fixed shape and no fixed volume?
 
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 2

A sound-producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound-producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one having a fixed volume but no fixed shape?

EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 2
A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound
producing body to the man. Which medium could be the one: Having the same composition as that on the moon?
 
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 2
A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one having a fixed shape and a fixed volume?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 3
Even if a loud explosion takes place at any place on the moon, it would not be heard at a nearby point.
Give reason.
 
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 3
 Explain in brief the dependence of speed of sound on nature of material medium and temperature.
 
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 5 - Sound>Exercise>Q 3
Identify the two factors on which the loudness of sound depends.