Waves PYQs - Last 10 Years

List-I shows four configurations made of straight and semi-circular narrow tubes containing air. A sound wave of wavelength $\lambda = 0.29\ \mathrm{m}$ enters these structures at the point $S$ and a sound detector is placed at $D$.
Between...

An audio transmitter $(T)$ and a receiver $(R)$ are hung vertically from two identical massless strings of length 8 m with their pivots well separated along the $X$ axis. They are pulled from the equilibrium position in opposite directions ...

A source (S) of sound has frequency $240 \mathrm{~Hz}$. When the observer (O) and the source move towards each other at a speed $v$ with respect to the ground (as shown in Case 1 in the figure), the observer measures the frequency of the so...

Two uniform strings of mass per unit length $\mu$ and $4 \mu$, and length $L$ and $2 L$, respectively, are joined at point $\mathrm{O}$, and tied at two fixed ends $\mathrm{P}$ and $\mathrm{Q}$, as shown in the figure. The strings are under...

Consider both sources emitting sound. When $S_2$ is at $R$ and $S_1$ approaches the detector with a speed $4 \mathrm{~m} \mathrm{~s}^{-1}$, the beat frequency measured by the detector is _________ $\mathrm{Hz}$.

When only $S_2$ is emitting sound and it is at $Q$, the frequency of sound measured by the detector in $\mathrm{Hz}$ is _________.

A string of length $1 \mathrm{~m}$ and mass $2 \times 10^{-5} \mathrm{~kg}$ is under tension $T$. When the string vibrates, two successive harmonics are found to occur at frequencies $750 \mathrm{~Hz}$ and $1000 \mathrm{~Hz}$. The value of ...

A source, approaching with speed u towards the open end of a stationary pipe of length L, is emitting a sound of frequency fs. The farther end of the pipe is closed. The speed of sound in air is v and f0 is the fundamental frequency of the ...

A stationary tuning fork is in resonance with an air column in a pipe. If the tuning fork is moved with
a speed of 2 ms−1
in front of the open end of the pipe and parallel to it, the length of the pipe should
be changed for the resonance to...

A musical instrument is made using four different metal strings, 1, 2, 3 and 4 with mass per unit length \(\mu\), 2\(\mu\), 3\(\mu\) and 4\(\mu\) respectively. The instrument is played by vibrating the strings by varying the free length...

A musical instrument is made using four different metal strings, 1, 2, 3 and 4 with mass per unit length \(\mu\), 2\(\mu\), 3\(\mu\) and 4\(\mu\) respectively. The instrument is played by vibrating the strings by varying the free length...

A train S1, moving with a uniform velocity of 108 km/h, approaches another train S2 standing on a platform. An observer O moves with a uniform velocity of 36 km/h towards S2, as shown in figure. Both the trains are blowing whistles of same...

In an experiment to measure the speed of sound by a resonating air column, a tuning fork of frequency \(500\) \(Hz\) is used. The length of the air column is varied by changing the level of water in the resonance tube. Two successive resona...

Two men are walking along a horizontal straight line in the same direction. The man in front walks at a speed \(1.0\,m{s^{ - 1}}\) and the man behind walks at a speed \(2.0\,m{s^{ - 1}}.\) A third man in standing at a height \(12\) \(m\) ab...

A stationary source emits sound of frequency \({f_0} = 492\,Hz.\) The sound is reflected by a large car approaching the source with a speed of \(2\,m{s^{ - 1.}}\) The reflected signal is received by the source and superposed with the origin...

A block \(M\) hangs vertically at the bottom end of a uniform rope of constant mass per unit length. The top end of the rope is attached to fixed rigid support at \(O.\) A transverse wave pulse (Pulse 1) of wavelength \({\lambda _0}\) is pr...