Embibe Experts Solutions for Chapter: Sound Waves, Exercise 6: Exercise (Previous Year Questions)

A source of unknown frequency gives $4$ $\mathrm{beats} {\mathrm{s}}^{-1}$, when sounded with a source of known frequency $250 \mathrm{Hz}$. The second harmonic of the source of unknown frequency gives five beats per second when sounded with a source of frequency $513 \mathrm{Hz}$. The unknown frequency is

The number of possible natural oscillations of air column in a pipe closed at one end of length $85 \mathrm{c}\mathrm{m}$ whose frequencies lies below $1250\mathrm{ }\mathrm{H}\mathrm{z}$ are: (velocity of sound $=340 {\mathrm{m}\mathrm{s}}^{-1}$)

The fundamental frequency of a closed organ pipe of length $20 \mathrm{cm}$ is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is $50 \mathrm{cm}$. The next larger length of the column resonating with the same tuning fork is

Three sound waves of equal amplitudes have frequencies $(n-1)$, $n$, $(n+1)$. They superimpose to give beats. The number of beats produced per second will be 

The two the nearest harmonics of a tube closed at one end and open at the other end are $220 \mathrm{Hz}$ and $260 \mathrm{Hz}$. What is the fundamental frequency of the system?

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $27°\mathrm{C}$, two successive resonances are produced at $20$ $ \mathrm{cm}$ and $73$ $\mathrm{cm}$ of column length. If the frequency of the tuning fork is $320$ $ \mathrm{Hz}$, the velocity of sound in air at $27°\mathrm{C}$ is,

Two waves of frequencies $10 \mathrm{KHz}$ and $10.2 \mathrm{KHz}$ propagate and superimpose. The time after which wave envelope repeats is,