Waves PYQs - Last 10 Years

If the speed of sound in air is 330 m/s then,
find the number of tones present in an open
organ pipe of length 1 m whose frequency is \(\le\) 1000 Hz.

Two sources of sound S\(_1\) and S\(_2\) are moving
towards and away from a stationary observer
with the same speed respectively. Observer
detects 3 beats per second. Find speed of
sources (approximately).
Given, \(f_1=f_2=500\) Hz, speed o...

A string wave equation is given \(y=0.002 \sin (300 t-15 x)\) and mass density is \((\mu=0.1 \mathrm{~kg} / \mathrm{m})\). Then find the tension force in the string.

Assertion To hear different beats difference
of the frequencies of two sources should be
less than 10.
Reason More the number of beats more in
the confusion.

A pipe of length 85 cm is closed from one
end. Find the number of possible natural
oscillations of air column in the pipe whose
frequencies lie below 1250 Hz. The velocity
of sound in air is 340 m/s.

A steel rod 100 cm long is damped at into
middle. The fundamental frequency of
longitudinal vibrations of the rod are given
to be 2.53 kHz. What is the speed of sound
in sound is steel?

The driver of a car travelling with speed \(30 \mathrm{~ms}^{-1}\) towards a hill sounds a horn of frequency \(600 \mathrm{~Hz}\). If the velocity of sound in air is \(330 \mathrm{~ms}^{-1}\), the frequency of reflected sound as heard by dr...