List of top Physics Questions on Waves

A wire of length \(1.2\,\text{m}\) is subjected to a tension of \(240\,\text{N}\). If the frequencies of two successive modes of vibration of the wire are \(200\,\text{Hz}\) and \(250\,\text{Hz}\), then the mass of the wire is

Lengths of two open pipes are in ratio 5:6. If 8 beats per second are heard when both vibrate in fundamental mode, find frequency of third harmonic of longer pipe.

A wire of length 100 cm is clamped between two rigid supports and vibrates in fundamental mode. If amplitude at midpoint is A, distance between two points having amplitude $\frac{A}{\sqrt{2}}$ is:}

Two observers \(A\) and \(B\) are moving towards a stationary source of sound with speeds \(0.8v_0\) and \(0.6v_0\) respectively, where \(v_0\) is the speed of sound in air. The ratio of the frequencies of the sound heard by the observers \(A\) and \(B\) is

A transverse wave is represented by $y = A \sin(kx - \omega t)$. The maximum particle velocity is

A string of mass 2.5 kg is under a tension of 200 N. The length of the stretched string is 20 m. If a transverse jerk is struck at one end of the string, the time taken for the disturbance to reach the other end is:

The frequency of a tuning fork P is 1.5% more than the frequency of tuning fork Q and the frequency of another tuning fork R is 2.5% less than the frequency of tuning fork Q. If 8 beats are produced per second when P and R are vibrated together, then the frequency of tuning fork R is

Two plane mirrors \(A\) and \(B\) are placed parallel to each other with a separation of \(2\,\text{m}\) between them. If an object is placed between the mirrors at a distance of \(60\,\text{cm}\) from mirror \(B\), then the distance of the second nearest image seen in mirror \(B\) from mirror \(A\) is \[ (\text{The reflecting surfaces of the two mirrors face each other}) \]

A source producing sound of frequency \(990\) Hz and an observer are initially at rest. If both the source and observer start moving simultaneously towards each other with accelerations \(2\ \mathrm{ms^{-2}}\) and \(4\ \mathrm{ms^{-2}}\) respectively, then the frequency of sound heard by the observer at a time \(t=5\) s is \[ (\text{Speed of sound in air}=340\ \mathrm{ms^{-1}}) \]

The frequency of a closed pipe is $f_1$ if it vibrates with two nodes and is $f_2$ if it vibrates with three nodes. If the difference between the frequencies $f_1$ and $f_2$ is 200 Hz, then the length of the pipe is (Speed of sound in air $=340\,ms^{-1}$)

If the length of a compound microscope is \(100\,\text{cm}\) and the focal length of its objective is \(5\,\text{cm}\), then the difference between the magnifications of the microscope when the final image forms at infinity and at the near point is \[ (\text{Least distance of distinct vision}=25\,\text{cm}) \]

In Young's double slit experiment, if the distance between the first dark fringe and the second bright fringe on the same side of the central maximum is \(1.5\,\text{mm}\), then the distance between the first dark fringe on one side and the second bright fringe on the other side of the central maximum is

Two stationary sources P and Q produce sounds of equal frequency of \(170\,Hz\). The velocity with which an observer has to move from source P towards source Q such that 8 beats are heard per second by the observer is:

If sound waves of frequency 169 Hz are incident horizontally on a perfectly rigid vertical wall, then the shortest distance from the wall at which the air particle will have maximum amplitude of vibration is:

The length of an open pipe is half of the length of another closed pipe. When the two pipes are vibrated, four nodes are formed in both the cases. The ratio of the frequencies of the open and the closed pipes is:

The speed of a progressive transverse wave on a string is \(18\ \mathrm{ms^{-1}}\). If the phase difference between two points on the string separated by a distance of \(3\) cm is \(90^\circ\), then the frequency of the transverse wave on the string is

The equation of a wave on a string of linear mass density \(0.02 \text{kg m}^{-1}\) is \(Y = 0.01sin[2π(\frac{t}{0.02}-\frac{x}{0.50})]\) m. The tension in the string is

In a resonance tube open at one end, the end correction is \(1.1\) cm. If the shortest length of resonating air column with a tuning fork is \(18\) cm, the next resonating length will be

Fifth overtone of an open pipe of length \(L_0\) is in unison with the fifth overtone of the pipe closed at one end of length \(L_c\).
The ratio \(L_0\) to \(L_c\) is

In a pipe closed at one end, air column is vibrating in the fourth overtone so the vibrating air column has '\(x\)' nodes and '\(y\)' antinodes. The values of \(x\) and \(y\) are respectively

In a sonometer experiment, the fundamental frequency of vibration of wire is '\(n_1\)' when wire is stretched by hanging a metal bob. If the bob is completely immersed in water, the frequency of vibration of wire becomes '\(n_2\)'. The relative density of the metal of the bob is

A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at given time interval of 0.01s is

A wire is under tension of \(2\) kg wt and a wave is travelling through it with some speed. Tension in the wire is so increased that the wave travels through it with thrice the original speed. The increase in tension is (in kg wt)

A Pipe open at one end has length \(0.8\) m. At the open end of the tube a string \(0.5\) m long is vibrating in its first overtone and resonates with fundamental frequency of pipe. If tension in the string is \(50\) N, the mass of string is (Neglect end correction) (Speed of sound \(= 320\) m/s)

A musical instrument P produces sound waves of frequency 'n' and amplitude 'A'. Another musical instrument Q produces sound waves of frequency n/4. The waves produced by P and Q have equal energies. The amplitude of waves produced by Q will be