NEET Physics Waves 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:

A stretched string of length L and mass m is under tension T. If a small transverse pulse is generated at one end, and another pulse, identical in shape but inverted, is generated at the other end simultaneously, at what time will the two pulses completely neutralize each other? Assume the pulses do not undergo any reflection.

Two tuning forks A and B produce 6 beats per second when sounded together. If the frequency of A is 512 Hz, what could be the frequency of B?

Two waves traveling in the same direction are described by $y_1 = A\sin(kx - \omega t)$ and $y_2 = A\sin(kx - \omega t + \frac{\pi}{3})$. What is the amplitude of the resultant wave?

Two guitar strings A and B, made of the same material, produce beats of frequency 6 Hz. When the tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, what was the original frequency of B?

Two tuning forks A and B, made of the same material, produce beats of frequency 5 Hz. When a small piece of wax is attached to B, the beat frequency increases to 8 Hz. If the frequency of A is 440 Hz, what was the original frequency of B?

Two whistles A and B produce beats of frequency 4 Hz. When the blowing pressure for whistle B is slightly reduced, its frequency decreases, and the beat frequency increases to 6 Hz. If the frequency of A is 250 Hz, what was the original frequency of B?

Two sources of sound, S1 and S2, produce beats of frequency 3 Hz. When the frequency of S2 is slightly increased, the beat frequency becomes 5 Hz. If the frequency of S1 is 600 Hz, what was the initial frequency of S2?

Two organ pipes, P1 and P2, produce beats of frequency 2 Hz. When the air pressure in P2 is slightly increased, its frequency increases, and the beat frequency changes to 4 Hz. If the frequency of P1 is 120 Hz, what was the initial frequency of P2?

Two monochromatic coherent light beams A and B have intensities $I$ and $\frac{I}{4}$ respectively. If these waves are superposed, the maximum and minimum intensities will be