Beats - Practice Questions & MCQ

Two identical strings are stretched at tensions . A turning fork is used to set them in vibration. A vibrates in its fundamental mode and in its second harmonic mode then -
 

The first overtone frequency of a closed organ pipe is equal to the fine overtone frequency of an open organ pipe. Further harmonic of a closed organ pipe is also equal to the harmonic of an open pipe, where are-
 

Two identical string instruments have frequency of . If the tension in one of them increases 4 % and they are sounded together, then the number of beats - in are -
 

The frequency of tuning forks A and B are respectively 3% more and 2% less than the frequency of tuning fork C. When A and B are simultaneously excited, 5 beats per second are produced. Then the frequency of the tuning fork A (in Hz) is -

Two closed pipes produce 10 beats per second when emitting their fundamental nodes. If their lengths are in the ratio of 25:26, then the ratio of fundamental frequency-

An organ pipe, open from both ends produces 5 beats per second when vibrating with a source of frequency 200 Hz in its fundamental mode. The second harmonic of the same pipe produces 10 beats per second with a source of frequency 420 Hz. The fundamental frequency of pipe is:-

A source of sound of frequency 500 Hz situated between a stationary observer  and a wall, moves towards the wall with a speed of 2 m/s. If the velocity of sound is 332 m/s, then the number of beats per second heard by the  observer is (approximately)-

When a stretched wire and a tuning fork are sounded together Y beats Per second are produced When the length of the wire is  90  cm or 100 cm frequency of the fork is 195 Hz, Then Y =?
 

Two turning forks of frequencies f₁ and f₂ produce 'f beats' per second. If f₂ and f are known,f₁ may be given by :

When a stretched wire and a tuning fork are sounded together, y beats per second are produced when the length of the wire is 85 cm or 90 cm, frequency of the fork is 180 Hz. Find the value of y.