Beats

Two tuning forks, $A$ and $B$ produce notes of frequencies $258 \mathrm{Hz}$ and $262 \mathrm{Hz}$. 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 closed organ pipe and an open organ pipe of same length produce $2 \mathrm{beats} {\mathrm{s}}^{-1}$ while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode 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 whistles $A$ and $B$ have frequencies $660 \mathrm{Hz}$ and $590 \mathrm{Hz},$ respectively. An observer is standing in the middle of the line joining the two sources. Source $B$ and observer are moving towards the right with velocity $30 \mathrm{m} {\mathrm{s}}^{-1}$ and $A$ is standing to the left side. If the velocity of sound in air is $300 \mathrm{m} {\mathrm{s}}^{-1}$. The number of beats per second listened by the observer are,

A closed organ pipe and an open organ pipe of same length produce $2 \mathrm{beats} {\mathrm{s}}^{-1}$ while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is

Two tuning forks, $A$ and $B$ produce notes of frequencies $258 \mathrm{Hz}$ and $262 \mathrm{Hz}$. 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

An organ pipe, open from both ends produces $5$ beats per second when vibrated with a source of frequency $200 \mathrm{Hz}$ in its fundamental mode. The second harmonic of the same pipe produces $10$ beats per second with a source of frequency $420 \mathrm{Hz}$. The fundamental frequency of pipe is

Two closed pipes produce $10$ beats per second when emitting their fundamental nodes. If their lengths are in the ratio of $25: 26.$ Then, their fundamental frequency in $\mathrm{Hz}$, are

The frequency of tuning forks $A$ and $B$ are respectively $3\%$ more and $2\%$ less than the frequency of tuning fork $C$. When $A$ and $B$ are simultaneously excited $5$ beats per second are produced. Then the frequency of the tuning fork $A$ (in $\mathrm{Hz}$) is,

When two tuning forks $A$ and $B$ are sounded together, $x$ beat per second 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

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

An accurate and reliable audio oscillator is used to standardise a tuning fork. When the oscillator reading is $514,$ two beats are heard per second. When the oscillator reading is $510,$ the beat frequency is $6 \mathrm{Hz}$. The frequency of the tuning fork (in $\mathrm{Hz}$) is,

Two sound waves of length $1 \mathrm{m}$ and $1.01 \mathrm{m}$ in a gas produce $10$ beats in $3 \mathrm{s}$. The velocity of sound in gas is,

Two identical string instruments have frequency of $100 \mathrm{Hz}$. If tension in one of them increases by $4\%$ and they are sounded together, then the number of beats in $1$ second 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 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

Distinguish between stationary waves and beats.

Two sound waves having wavelengths of $87 \mathrm{cm}$ and $88.5 \mathrm{cm}$ respectively, when superimposed, produce $10$ beats per second. Find the velocity of the sound.

Describe Quincke's tube experiment to explain the phenomenon of beats.