EASY
AP EAPCET
IMPORTANT
Earn 100
In case of a forced vibration, the resonance wave becomes very sharp when the:
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Important Questions on Sound Waves
MEDIUM
AP EAPCET
IMPORTANT
A cylindrical tube open at both ends has a fundamental frequency in air. The tube is dipped vertically in water so that of the tube is in water. Then the fundamental frequency of air column is
HARD
AP EAPCET
IMPORTANT
If the length of a stretched string is shortened by and the tension is increased by then the ratio of the initial and final fundamental frequencies is , the value of is
EASY
AP EAPCET
IMPORTANT
A string fixed at both ends vibrates in loops as shown in the figure. The total number of nodes and antinodes respectively are
MEDIUM
AP EAPCET
IMPORTANT
A closed organ pipe and an open organ pipe of same length produce when they are set into vibrations together in fundamental mode. The length of open pipe is now halved and that of closed pipe is doubled. The number of beats produced will be
MEDIUM
AP EAPCET
IMPORTANT
A source is stationary and the observer is in motion along a line joining the source and the observer. If the frequency heard by the observer is higher than the true frequency, the ratio of velocity of the observer and that of sound in air is:
MEDIUM
AP EAPCET
IMPORTANT
A train approaching a railway crossing at a speed of sounds a whistle of frequency , when it is away from the crossing. The frequency heard by the observer standing on the road perpendicular to the track from the crossing at a distance of is (Speed of sound in air )
EASY
AP EAPCET
IMPORTANT
A small source of sound vibrating at a frequency is rotated along a circle of radius at a constant angular speed of revolutions per second. The minimum and maximum frequency of the sound observed by a listener situated in the plane of the circle is (Speed of sound is )
MEDIUM
AP EAPCET
IMPORTANT
The sources of sound and produce a wave of in same phase. A particle is vibrating under an influence of these two waves. If the amplitudes at produced by the two waves is and , the resultant amplitude of the point will be, when and the velocity of sound is .
