Waves PYQs - Last 5 Years

In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20.0 cm for a tuning fork of frequency 400 Hz is used. The velocity o...

The velocity of sound in a gas, in which two wavelengths 4.08 m and 4.16 m produce 40 beats in 12s, will be :

A tunning fork of frequency 340 Hz resonates in the fundamental mode with an air column of length 125 cm in a cylindrical tube closed at one end. When water is slowly poured in it, the minimum height of water required for observing resonanc...

The frequency of echo will be __________ Hz if the train blowing a whistle of frequency 320 Hz is moving with a velocity of 36 km/h towards a hill from which an echo is heard by the train driver. Velocity of sound in air is 330 m/s.

In the wave equation
\(y=0.5 \sin \frac{2 \pi}{\lambda}(400 \mathrm{t}-x) \,\mathrm{m}\)
the velocity of the wave will be:

An observer moves towards a stationary source of sound with a velocity equal to one-fifth of the velocity of sound. The percentage change in the frequency will be :

If a wave gets refracted into a denser medium, then which of the following is true?

A wire of length 30 cm, stretched between rigid supports, has it's nth and (n + 1)th harmonics at 400 Hz and 450 Hz, respectively. If tension in the string is 2700 N, it's linear mass density is ____________ kg/m.

A set of 20 tuning forks is arranged in a series of increasing frequencies. If each fork gives 4 beats with respect to the preceding fork and the frequency of the last fork is twice the frequency of the first, then the frequency of last for...

When a car is approaching the observer, the frequency of horn is \(100 \mathrm{~Hz}\). After passing the observer, it is \(50 \mathrm{~Hz}\). If the observer moves with the car, the frequency will be \(\frac{x}{3} \mathrm{~Hz}\) where $$x=$...

A transverse wave is represented by \(y=2 \sin (\omega t-k x)\, \mathrm{cm}\). The value of wavelength (in \(\mathrm{cm}\)) for which the wave velocity becomes equal to the maximum particle velocity, will be :

The first overtone frequency of an open organ pipe is equal to the fundamental frequency of a closed organ pipe. If the length of the closed organ pipe is 20 cm. The length of the open organ pipe is _____________ cm.

An observer is riding on a bicycle and moving towards a hill at \(18 \,\mathrm{kmh}^{-1}\). He hears a sound from a source at some distance behind him directly as well as after its reflection from the hill. If the original frequency of the ...

Two waves executing simple harmonic motions travelling in the same direction with same amplitude and frequency are superimposed. The resultant amplitude is equal to the \(\sqrt3\) times of amplitude of individual motions. The phase differen...

The equations of two waves are given by :
y1 = 5 sin 2\(\pi\)(x - vt) cm
y2 = 3 sin 2\(\pi\)(x \(-\) vt + 1.5) cm
These waves are simultaneously passing through a string. The amplitude of the resulting wave is :

Two travelling waves of equal amplitudes and equal frequencies move in opposite directions along a string. They interfere to produce a stationary wave whose equation is given by \(y = (10\cos \pi x\sin {{2\pi t} \over T})\) cm
The amplitude...