Chapter Questions
Define echo.
What are forced vibrations? Give an example.
In resonance, the body undergoing forced vibrations vibrates with ____ amplitude.
What is meant by the fundamental frequency of a vibrating stretched string?
How does humidity in air affect the velocity of sound in it?
What is the expression for the velocity of sound in air using resonating air column method?
How does the intensity of sound vary with its amplitude and density of a medium?
The energy carried by a progressive wave is the sum of ____and ____of the vibrating particles of the medium.
Define audible range.
What are damped vibrations? Give an example.
Define transverse and longitudinal waves.
When a tuning fork of $512 \mathrm{~Hz}$ is used, the first and the second resonating lengths of closed air column are obtained as $16 \mathrm{~cm}$ and $48 \mathrm{~cm}$ respectively. What is the velocity of sound in air in metre per second?
What is the characteristic of sound that distinguishes between two sounds of equal amplitude and frequency?
What is the expression for the velocity of a stationary wave set in a stretched string?
Define progressive and stationary waves?
What are infrasonics and ultrasonics?
The time taken to reduce the intensity of sound to ____of the initial value is called reverberation time.
What is resonating air column?
Mention Newton's formula for the velocity of sound in a medium, and Laplace correction to Newton's formula.
What is the pitch of a sound?
How does the intensity of sound vary with the distance of the point of observation from the source of sound?
. What is the principle used in a mega-phone?
How does the velocity of sound in a gas vary with absolute temperature?
Define reverberation.
Hertz is the unit of____
How many antinodes are obtained when a closed end resonating air column vibrates in the fundamental mode?
. How does the velocity of sound in a gas vary with its molecular weight, and pressure?
If the fundamental frequency of a vibrating stretched string is $200 \mathrm{~Hz}$, what are its 1 st and $2 \mathrm{nd}$ overtones?
What are natural vibrations? Give an example.
By changing either the wavelength or the frequency of a sound wave, is it possible to change the velocity of sound in a medium?
Explain resonance with an example?
A string is stretched by a tension of $200 \mathrm{~N}$. If its linear density is $2 \times 10^{-2} \mathrm{~kg} \mathrm{~m}^{-1}$, what is the velocity of waves set in the string?
Explain the formation of stationary waves in a stretched string.
In a resonating air column method, the first and the second resonating air columns are $16 \mathrm{~cm}$ and $48 \mathrm{~cm}$ respectively. If the frequency of a tuning fork used is $500 \mathrm{~Hz}$, find the velocity of sound in air.
The first resonating length of a closed end air column is $30 \mathrm{~cm}$. At approximately, what length of the air column do we obtain the second resonance?
Differentiate between progressive and stationary waves.
The fundamental frequency of an air column in a closed end tube is $30 \mathrm{~Hz}$. Find the frequency of the third harmonic.
If the velocity of sound in air is $300 \mathrm{~m} \mathrm{~s}^{-1}$, express the audible range in terms of wavelength.
Explain the factors on which the velocity of sound in a given gas depends.
The velocity of the sound in a gas is $300 \mathrm{~m} \mathrm{~s}^{-1}$. The density of gas and the ratio of specific heats of gas are given by $0,002 \mathrm{~g} \mathrm{~cm}^{-2}$ and 2 respectively. Find the pressure of the gas.
If the velocity of sound in air is $330 \mathrm{~m} \mathrm{~s}^{-1}$, what is the minimum distance between the source or the observer of sound and the reflector to hear an echo?
What are the factors which do not affect the velocity of sound in a gas?
The molecular weights of two gases $A$ and $B$ are given as 36 units and 16 units respectively. If the velocity of sound in gas A is $300 \mathrm{~m} \mathrm{~s}^{-1}$, find the velocity of sound in B.
The velocity of sound in a gas at $0^{\circ} \mathrm{C}$ is $\mathrm{x} \mathrm{m} \mathrm{s}^{-1}$. At what temperature of the gas, does the velocity of sound become $2 \mathrm{x} \mathrm{m} \mathrm{s}^{-1}$ ?
How do you determine the velocity of sound in air using an echo?
Explain the formation of transverse stationary waves in stretched strings and their different modes of vibration.
Explain resonance in sound boxes.
Explain resonance in air columns.
Explain the laws of transverse vibrations in stretched strings.
Describe an experiment to find out the velocity of sound in air using resonating air columns.