NEET Physics Waves Velocity Of Sound MCQs

Two sound waves of equal amplitude and slightly different frequencies $f_1$ and $f_2$ are travelling in the same direction. The time interval between successive maxima of intensity is:

5 beats/second are heard when a turning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire is either 0.95 m or 1 m. The frequency of the fork will be :

When a stretched wire and a tuning fork are sounded together 5 beats per second are heard in both cases, when the lengths of stretched wire were 100 cm or 95 cm in fundamental mode with same tension. Then frequency of tuning fork is (Hz)

Two identical plain wires have a fundamental frequency of $600$ cycle per second when kept under the same tension. What fractional increase in the tension of one wires will lead to the occurrence of $6$ beats per second when both wires vibrate simultaneously

Two identical flutes produce fundamental notes of frequency $300\,\,Hz$ at ${27^{0\,}}C$. If the temperature of air in one flute is increased to ${31^{0\,}}C$, the number of the beats heard per second will be