Beats

When two tuning forks $A$and $B$ are sounded together a beat frequency of $3 \mathrm{Hz}$ is produced. When $B$ in waxed and again $A$ and $B$ are sounded together the beat frequency increased to $5 \mathrm{Hz}$. If the frequency $A$ of in $512 \mathrm{Hz}$, the frequency of fork $B$ (before it is waxed) maybe

A person riding on a source '$S$' of sound (frequency $48 \mathrm{Hz}$) moves in a medium (in which velocity of sound is $310 \mathrm{m} {\mathrm{s}}^{-1}$ ) with speed $10 \mathrm{m} {\mathrm{s}}^{-1}$ as shown towards a liquid reservoir (in which velocity of sound is $1240 \mathrm{m} {\mathrm{s}}^{-1}$). A detector '$D$' in the reservoir moves towards the free surface of the reservoir (along line $SD$) at a speed $20 \mathrm{m} {\mathrm{s}}^{-1}$. The sound produced by '$S$' gets reflected and transmitted at the free surface. Mark the INCORRECT statement(s) among the following, assuming the liquid in the reservoir stays still and calm.

There are four tuning forks, and one of them has frequency $553 \mathrm{Hz}$. By using any two forks at a time, the beat frequencies heard are $1,2,3,5,7,8$. Which of the following could be a possible set of frequencies of other three forks.

There are four tuning forks, and one of them has frequency $553 \mathrm{Hz}$. By using any two forks at a time, the beat frequencies heard are $1,2,3,5,7,8$. The possible frequencies of other three forks are

Two notes $A$ and $B$, sounded together, produce 2 beats per $\sec$. Notes $B$ and $C$ sounded together produces 3 beats per second. The notes A and C separately produce the same number of beats with a standard tuning fork of $456 \mathrm{Hz}$. The possible frequency of the note $B$ is

If the two frequencies of waves are $550\mathrm{Hz} \mathrm{and} 380\mathrm{Hz}$ respectively. The beat frequency is _____.

There is a source of sound (a tuning fork) moving towards a reflecting wall with a speed of $30 \mathrm{m} {\mathrm{s}}^{-1}$. The velocity of the sound in air is $330 \mathrm{m} {\mathrm{s}}^{-1}$ and the frequency of the tuning fork is $600 \mathrm{Hz}$. The observer is between the source and the wall and is moving with some velocity $V_1$ towards the wall. The beat frequency heard by the observer is $4 \mathrm{Hz}$. If the tuning fork is waxed, the frequency beats heard by the observer becomes $3 \mathrm{Hz}$. If the new frequency of tuning fork is $k$ then $\raisebox{1ex}{$k$}\!\left/ \!\raisebox{-1ex}{$50$}\right.$ is

Two tuning forks have frequencies $450 \mathrm{Hz}$ and $454 \mathrm{Hz}$ respectively. On sounding these forks together, the time interval between two successive maximum intensities will be _____.

Two waves each of loudness $L$ superimpose to produce beats. The maximum loudness of beats will be

Two tuning forks have frequencies $450 \mathrm{Hz}$ and $454 \mathrm{Hz}$ respectively. On sounding these forks together, the time interval between two successive maximum intensities will be _____.

Two sound waves of wavelength $2 \mathrm{m}$ and $2.02 \mathrm{m}$ produce $15$ beat in $3 \mathrm{seconds}$ in a medium. The velocity of sound in that medium is

When two tuning forks are sounded together $\mathrm{x}$ beats $/\sec$ are heard frequency of $\mathrm{A}$ is $\mathrm{n}$. Now when one prong of $\mathrm{B}$ is loaded with a little wax,the number of beats per second decreases the frequency of fork $\mathrm{B}$ is :

Two tuning forks have frequencies $300 \mathrm{Hz}$ and $308 \mathrm{Hz}$. When they are sounded together, after hearing the maximum sound, how long will it take to hear the first minimum sound?

A set of $36$ tuning forks is arranged in series of decreasing frequencies. Each fork gives $3$ beats with succeeding one. The fork is an octave of the last. The frequency of the $15\mathrm{th}$ tuning fork from start is $\dots \dots$

When an air column at $15°\mathrm{C}$ and a tunning fork are sounded together then $4$ beats per second are produced, the frequency of the fork is less then that of air column. When the temperature falls to $10°\mathrm{C}$, then the beat frequency decreases by one. The frequency of the fork will be- $\left[{\mathrm{v}}_{\text{sound }}\right.$ at $\left.0°\mathrm{C}=332 \mathrm{m} {\mathrm{s}}^{-1}\right]$

When a tuning fork of frequency $341$Hz is sounded with another tuning fork, six beats per second are heard. When the second tuning fork is loaded with wax and sounded with the first tuning fork, the number of beats is two per second. The natural frequency of the second tuning fork is:

Two waves of wavelength $\lambda$ and $\left(\lambda +\Delta \lambda \right)$ produce $5$ beats per second. If $\frac{\Delta \lambda }{\lambda }=\frac{\lambda +\Delta \lambda }{65}$ find the speed of sound waves in gas in which these waves produced beats.

When $0.98 \mathrm{m}$ long metallic wire is stressed, an extension of $0.02 \mathrm{m}$ is produced. An organ pipe $0.5 \mathrm{m}$ long and open at both ends, when sounded with this stressed metallic wire produces $8$ beats per second in their fundamental mode. By decreasing the stress in the wire, the number of beats is found to decrease. The young's modulus of the wire is (The density of wire is ${10}^4 \mathrm{kg} {\mathrm{m}}^{-3}$ and sound velocity in air is $292 \mathrm{m} {\sec }^{-1}$ )

A tuning fork of frequency $480 \mathrm{Hz}$ produces $10$ beats per second when sounded with a vibrating sonometer string. What must have been the frequency of the string if a slight increase in tension produces lesser beats per second than before :

Two tuning fork when sounded together produces $5$ beats per second the first tuning fork is in resonance with $16.0 \mathrm{cm}$ wire of a sonometer and second is in the resonance with $16.2 \mathrm{cm}$ wire of the same sonometer both in fundamental mode the frequencies of the tuning forks are: