Waves practice · Medium

In the case of sustained forced oscillations, the amplitude of oscillations

Choose the false statement(s) about speed of transverse waves on a stretched string.
(i) It depends on linear mass density of the string.
(ii) It depends on the tension in the string in.
(iii) It depends on the frequency of the wave.

Assertion(A): If temperature is increased, fundamental frequency of an close pipe will increase.

Reason(R): By increasing the temperature, speed of sound wave will increase.

In order to double the frequency of the fundamental note emitted by a stretched string, the length is reduced to $3/4th$ of the original length and the tension is changed. The factor by which the tension is to be changed, is

Two waves of frequencies $20 \mathrm{~Hz}$ and $30 \mathrm{~Hz}$ travel out from a common point. How will they differ in phase at the end of 0.75 second?

A U-tube having unequal arm-lengths has water in it. A tuning fork of frequency $440 \mathrm{~Hz}$ can set up the air in the shorter arm in its fundamental mode of vibration and the same tuning fork can set up the air in the longer arm in its first overtone vibration. Find the length of the air columns. Neglect any end effect and assume that the speed of sound in air $=330 \mathrm{~ms}^{-1}$.

The fundamental frequency of a vibrating organ pipe is $10 \mathrm{~Hz}$. Select the wrong alternative.

Define Mach Number.

The engine of a train sounds a whistle at frequency $v$. The frequency heard by a passanger is (If wind is blowing from passanger side to Train side):

Two stretched strings have lengths $l$ and $2l$ while tensions are T and 4T respectively. If they are made of same material the ratio of their frequency is

An observer moves towards a stationery source of sound with a velocity one-fifth of the velocity of sound. The percentage increase in the apparent frequency is

The amplitude of a damped oscillator decreases to 0.9 times its original magnitude is 5 s. In another 10 s, it will decrease to $\alpha$ times its original magnitude, where $\alpha$ equals

A long string, having a cross-sectional area $0.80 \mathrm{~mm}^2$ and density $12.5 \mathrm{~g} / \mathrm{cm}^3$ is subjected to a tension of 64 N along the x-axis. One end of the string is attached to a vibrator moving in transverse direction. At $t=0,$ the source is at maximum displacement $y=1 \mathrm{~cm}.$ Find the speed of wave travelling on the string.

Which of the following equations represents a wave?

If the successive frequencies in a one end closed organ pipe are 245 and $315 \mathrm{~Hz}$ respectively, then the frequency of third overtone will be

The speed of sound in a medium depends on

A microphone of cross-sectional area ' $0.40 ' \mathrm{cm}^2$ is placed in front of the small speaker emitting $\pi \mathrm{W}$ of sound output. If the distance between microphone and the speaker is $2.0 \mathrm{~m}$, how much energy falls on the microphone in $5.0 \mathrm{~s}$ ?

Speed of sound wave in air

For a sinusoidal wave represented by $y(x, t)=a \sin (k x-\omega t+\phi)$ for a given $a$, the factor determines the displacement of the wave of any position and at any instant is:

If the adiabatic constants for helium and hydrogen gases at the same temperature are $5 / 3$ and $7 / 5$ respectively, then the ratio of velocity of sound in these gases will be-

Frequencies of sound produced from an organ pipe open at both ends are:

Which of the following functions represent a wave?

Which one of the following is a simple harmonic motion

The pressure wave $p = 0.01\sin \left[ {1000t - 3x} \right]N{m^{ - 2}},\,$ corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is $0^\circ C$. On some other day when temperature is $T$, the speed of sound produced by the same blade and at the same frequency is found to be $336\;m{s^{ - 1}}$. Approximate value of $T$ is

The complete destructive interference of two sound waves takes place when the two waves are travelling in the same direction

If $v$ is the speed of sound in air then the shortest length of the closed pipe which resonates to a frequency $v$, is

The velocity of sound in a gas, in which two wavelengths $4.08\,{\text{m}}\,\,{\text{and}}\,{\text{4}}{\text{.16}}\,{\text{m}}$ produce 40 beats in 12 s, will be:

In a resonance tube, closed at one end by a smooth moving piston and the other end open, exhibits the first three resonance lengths of air column, $L_1, L_2$ and $L_3$ for the same tuning fork. Then, they are related as

Walls of auditorium should be

Statement-I: The change in frequency due to Doppler effect does not depend on separation between the source and the observer.
Statement-II: When a listener and sound source are moving with the same velocity in the same direction, the apparent frequency as heard by listener increases.