Waves practice · Mixed difficulty

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

‘SONAR’ emits which of the following waves

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.

Three successive resonance frequencies in an organ pipe are 1310,1834 and $2358 \mathrm{Hz}$. The frequency of $1^{\text {st }}$ overtone (in $\mathrm{Hz}$ ) is (velocity of sound in air is $340 \mathrm{m} / \mathrm{s}$ )

For which of the following cases, there will be no Doppler effect?

A closed organ pipe of length $L$ and open organ pipe contain gases of densities ${\mathrm{\rho}_1}\,\,\mathrm{and}\,\,{\mathrm{\rho}_2}$ respectively. The compressibility of gases are equal in both the pipes. Both the pipes are vibrating in their first overtone with same frequency. The length of the open organ pipe is

In a resonance tube the first resonance with a tuning fork occurs at $16\,\,cm$ and second at $49\,\,cm$. If the velocity of sound is $330\,\,m/s$, the frequency of tuning fork is

If the frequency of human heart beat is $1.25\,\,\mathrm{Hz}$, the number of heart beats in $1$ minute is

Statement-I: Beats can be observed by two light sources as in sound.
Statement-II: To observe beats by two light sources, the phase difference between the two sources should change regularly.

It is possible to hear beats from the two vibrating sources of frequency

Two trains are moving towards each other with speeds of $20\,\,m/s\,\,\,and\,\,\,15\,\,m/s$ relative to the ground. The first train sounds whistle of frequency $600\,\mathrm{ }Hz$, the frequency of the whistle heard by a passenger in the second train before the meets is (the speed of sound in air is $340\mathrm{ }m/s$)

When a guitar string is sounded with a $440\,\,Hz$ tuning fork, a beat frequency of $5\,\,Hz$ is heard. If the experiment is repeated with a tuning fork of $437\,\,Hz$, the beat frequency is $8\,\,Hz$. The string frequency $\left( {Hz} \right)$ is

Standing waves can be obtained in an air column even if interfering waves are

Velocity of sound in air is $332 \mathrm{~m} / \mathrm{s}$. Velocity in vacuum will be

Two tuning forks have frequencies 450 Hz and 454 Hz respectively. On sounding these forks together, the time interval between successive maximum intensities will be

Assertion: In longitudinal wave propagation the distance between two consecutive compression is equal to wavelength of wave.
Reason: Standing wave does not get transfered.

There are three  sources of sound of equal intensity with frequencies $400,\mathrm{ }401\mathrm{ }and\,402\,\,vib/sec.$. The number of beats heard per second is

The angle between wave velocity and particle velocity in a travelling wave may be

Two tuning fork $P\,\,and\,\,\mathrm{Q}$ when set vibrating give $4{\mkern 1mu} {\mkern 1mu} \,beats/s$. if a prong of the fork $P$ is filed the beats are reduced to $2\,\,{s^{ - 1}}$. What is frequency of $P$, if that of $Q$ is $250\,\,Hz$?

Which of the following statement is true about stationary waves?

${n_1}$ is the frequency of the pipe closed at one end and ${n_2}$ is the frequency of the pipe open at both ends. If both are joined end to end, find the fundamental frequency of closed pipe so formed

For a certain organ pipe, three successive resonance frequencies are observed at $425,595$ and $765 \mathrm{~Hz}$. The speed of sound in air is $340 \mathrm{~ms}^{-1}$. The pipe is a

The velocity of waves in a string fixed at both ends is $2\,\,m/s$. The string forms standing waves with nodes $5.0\,\,cm$ apart. The frequency of vibration of the string in $Hz$ is

A $1000\,\,Hz$ sound wave in air strikes the surface of a lake and penetrates into water. If speed of sound in water is $1500\,\,\mathrm{m}{\mathrm{s}^{ - 1}}$, the frequency and wavelength of waves in water are

3 successive overtones frequencies of an organ pipe is given by $360 \mathrm{~Hz}, 600 \mathrm{~Hz}, 840$ $\mathrm{Hz}$. Find out nature and fundamental frequency of organ pipe.

Determine the change in volume of 6 litres of alcohol if the pressure is decreased from $200 \mathrm{~cm}$ of $\mathrm{Hg}$ to $75 \mathrm{~cm}$. [velocity of sound in alcohol is $1280 \mathrm{~m} / \mathrm{s}$, density of alcohol $=0.81\,\mathrm{gm} / \mathrm{cc}$, density of $\mathrm{Hg}=13.6\,\mathrm{gm} / \mathrm{cc}$ and $\left.g=9.81 \mathrm{~m} / \mathrm{s}^2\right]$.

A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

Assertion: In the case of a stationary wave, a person hear a loud sound at the nodes as compared to the antinodes.
Reason: In a stationary wave all the particles of the medium vibrate in phase.

I. In a closed organ pipe, standing waves can be formed.

II. In a closed organ pipe (closed at one end), only odd harmonics are present.

III. The harmonics which are present in a pipe, open at both ends are odd harmonics only.

Which of the following statement(s) related to organ pipe is/are correct?