Waves and Sound

The speed of sound in oxygen at S.T.P. will be approximately: (Given, $\left.\mathrm{R}=8.3 \mathrm{JK}^{-1}, \gamma=1.4\right)$

A plane progressive wave is given by $y=2 \cos$ $2 \pi(330 t-x) \mathrm{m}$. The frequency of the wave is:

The engine of a train moving with speed $10 \mathrm{~ms}^{-1}$ towards a platform sounds a whistle at frequency $400 \mathrm{~Hz}$. The frequency heard by a passenger inside the train is (neglect air speed. Speed of…

The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:

A direct current of $6 \mathrm{~A}$ is superimposed on an alternating current $I=10 \sin \omega t$ flowing through a wire. The effective value of the resulting current will be

Transverse waves of the same frequency are generated in two steel wires $A$ and $B$. The diameter of $A$ is twice that of $B$ and the tension in $A$ is half that in $B$. The ratio of the velocities of the waves in $A$…

The displacement y of a particle in a medium can be expressed as, $y=10^{-6} \sin \left(100 t+20 x+\frac{\pi}{4}\right) m$ where $t$ is in second and $x$ in meter. The speed of the wave is

The frequency of whistle of an engine appears to be $(4 / 5)^{\text {th }}$ of initial frequency when it crosses a stationary observer. If the velocity of sound is $330 \mathrm{~m} / \mathrm{s}$, then the speed of…

A whistle of frequency $1000 \mathrm{~Hz}$ is sounded on a car travelling towards a cliff with velocity of 18 $\mathrm{~m} \mathrm{~s}^{-1}$ normal to the cliff. If $\mathrm{c}=330 \mathrm{~m} \mathrm{~s}^{-1}$, then…

If sound travels in air with the speed of $340 m {s}^{-1}$, then the number of tones present in an open organ pipe of length $2 m$ for a maximum frequency of $1200 \text{Hz}$, are

Two sources of sound $A$ and $B$ are moving towards and away from a stationary observer with the same speed respectively. If the frequency of the sound produced by both the sources is equal to $400 \text{Hz}$, then the…

A train moves towards a stationary observer with speed $34 m {s}^{-1}$. The train blows whistle and its frequency is registered by the observer as ${ν}_{1}$. If the train's speed is reduced to $17 m {s}^{-1},$ then the…