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1.
Ultrasonic, Infrasonic and audible waves travel through a medium with speeds 
and 
respectively, then
and respectively, then
2.
In an open organ pipe... wave is present.
3.
When beats are produced by two progressive waves of the same amplitude and of nearly the same frequency, the ratio of maximum loudness to the loudness of one of the waves will be 
Where 
is
Where is
4.
An aeroplane be is above the head of an observer and the sound appears to be coming at an angle of 
with the vertical. If velocity of sound is 
, then the speed of aeroplane is
with the vertical. If velocity of sound is , then the speed of aeroplane is
5.
A uniform rope having mass 
hangs vertically from a rigid support. A transverse wave pulse is produced at the lower end. The speed () of wave pulse varies with height 
from the lower end as shown in figure.
hangs vertically from a rigid support. A transverse wave pulse is produced at the lower end. The speed () of wave pulse varies with height from the lower end as shown in figure.
6.
At what speed should a source of sound move so that stationary observer finds the apparent frequency equal to half of the original frequency
7.
What is the base frequency if a pipe gives notes of frequencies 425, 255 and 595 and decide whether it is closed at one end or open at both ends
8.
In a sonometer wire, the tension is maintained by suspending a 
mass from the free end of the wire. The suspended mass has a volume of 
The fundamental frequency of the wire is 
If the suspended mass is completely submerged in water, the fundamental frequency will become (take 
)
mass from the free end of the wire. The suspended mass has a volume of The fundamental frequency of the wire is If the suspended mass is completely submerged in water, the fundamental frequency will become (take )
9.
If the temperature is raised by 1 K from 300 K the percentage change in the speed of sound in the gaseous mixture is (R=8.31 J/mol-K)
10.
Two open organ pipes gives 
when sounded together in their fundamental nodes. If the length of the pipe are 
and 
respectively, then the velocity of sound is :
when sounded together in their fundamental nodes. If the length of the pipe are and respectively, then the velocity of sound is :