Waves practice · Medium

Water waves produced by a motor boat sailing in water are

Light can travel in vacuum but not sound, because

If in a resonance tube a oil of density higher than that water is used then at the resonance frequency would

Assertion: Transverse waves can travel in all medium.
Reason: All the gases have some bulk modulus.

The equation of two harmonic waves are given by
$y_1=3 \sin 2 \pi(x-v t) \mathrm{cm}$
$y_2=4 \cos 2 \pi(x-v t+1.5) \mathrm{cm}$
These waves are simultaneously passing through a string. The amplitude of the resulting wave is:

Assertion: Two waves moving in a uniform string having uniform tension cannot have different velocities.
Reason: Elastic and inertial properties of string are same for all waves in same string. but speed of wave in a string does not depend on its elastic and inertial properties only.

Assertion: Only longitudinal mechanical waves can propagate in gases.
Reason: Gases have only bulk modulus.

When two sinusoidal waves moving at right angles to each other superimpose, they produce

Let speed of sound waves in hydrogen gas at room temperature is ${v_0}$. What will be the speed of sound waves in a room which contains oxygen at same temperature:-

A student sees a jet plane flying from east to west. When the jet is seen just above his head, the sound of jet appears to reach him making angle $60^{\circ}$ with the horizontal from east. If the velocity of sound is $v$. then that of the jet plane is

Water waves are

If a source emitting waves a velocity $v/4$ and the observer moves away from the source with a velocity $v/6$, the apparent frequency as heard by the observer will be ($v$=velocity of sound)

Amplitude of 2 waves are $a_1$ and $a_2$, where $a_1=a_2=a$ and both are superimposed at $P$ where path difference between then is $\frac{\lambda}{4}$. Find amplitude of resultant wave.

If ${A}$ is the amplitude of the wave coming from a point source at distance ${r}$ then

From a point source, if amplitude of waves at a distance $r$ is A, its amplitude at a distance $2r$ will be

Two sound waves having a phase difference of ${60^0}$ have path difference of

A tuning fork of known frequency $256\,\,Hz$ makes $5\,\,beats/s$ with the vibrating string of a piano. The beat frequency decreases to $2\,\,beats/s$ when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was

In two similar wires of tension $16\,\,N$ and $T$, $3\,\,beats$ are heard, then $T =$

When two wave of almost equal frequencies ${n_1}\,\,and\,\,{n_2}$ are produced simultaneously, then the time interval between successive maxima is

Ultrasonic waves can be used to

Stationary waves are formed when

For a particular tube, three harmonic are $300 \mathrm{~Hz}$, $600 \mathrm{~Hz}$ and $750 \mathrm{~Hz}$. The other possible frequencies of oscillations in the tube are

When two tuning forks $A$ and $B$ are sounded together, $x$ beat/s are heard. Frequency of $A$ is $n$. Now, when one prong of fork $B$ is loaded with a little wax, the number of beats decreases. The frequency of fork $B$ is

The Doppler’s effect is applicable for

Two tuning fork, $A$ and $B$ produce notes of frequencies $258\,\,Hz$ and $262\,\,Hz$. An unknown note sounded with a produces certain beats. When the same note is sounded with $B$, the beat frequency gets doubled, the unknown frequency is

A longitudinal progressive wave is given by the equation $y=5 \times 10^{-2} \sin \pi(400 {t}+{x}) {m}$. Find (i) amplitude (ii) frequency (iii) wave length and (iv) velocity of the wave. (v) velocity and acceleration of particle at ${x}=\frac{1}{6} {~m}$ at ${t}=0.01$ s (vi) maximum particle velocity and acceleration.

A tuning fork of frequency $392\,\,Hz,$, resonates with $50\,\,cm$ length of a string under tension $\left( T \right)$. If length of the string is decreased by $2\%$, keeping the tension constant, the number of beats heard when the string and the tuning fork made to vibrate simultaneously is

A source emits a sound of frequency of $400\,\,Hz$, but the listener hearts its $390\,\,Hz$. Then

Speed of sound waves in a fluid depends upon

A tuning fork vibrates with 2 beats in $0.04$ second. The frequency of the fork is