EASY
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The following four graphs were plotted by a student representing the variation of velocity of sound in a gas with the pressure  P . Assume the temperature of the gas to be remain unchanged during the process. The correct graph is

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Important Questions on Sound Waves

MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A bomb explodes at time t=0 in a uniform, isotropic medium of density ρ and releases energy E, generating a spherical blast wave. The radius R of this blast wave varies with time t as
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Two waves of sound of wavelength 1.2 m and 1.25 m in a medium produce 90 beats in 10 s. The speed of sound in the medium is
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Consider a gas with molar mass M. If the sound at frequency f is introduced to a tube of this gas at temperature T then an internal acoustic standing wave is set up with nodes separated by L. The adiabatic constant γ=CpCv is
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
When sound travels from air to water the quantity that remains unchanged is
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Sound waves of wavelength λ and velocity v in medium- 1 enter medium- 2 . If their velocity in medium- 2 is 4 v, the wavelength in medium- 2 is
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
The velocity of sound in air is independent of change in
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A sound wave of frequency 200 Hz is travelling in air. The speed of sound in the air is 340 m s-1. What is the phase difference at a given instant between two points separated by a distance of 85 cm along the direction of propagation?
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A simple pendulum of length L has mass M and it oscillates freely with amplitude A. At the extreme position, its potential energy is (g = acceleration due to gravity)
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
It takes 2.0 seconds for a sound wave to travel between two fixed points when the day temperature is 10°C. If the temperature rises to 30°C, the sound wave travels between the same fixed parts in
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A hospital uses an ultrasonic scanner to locate tumors in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km/s. The wavelength of sound in the tissue is
HARD
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Sound travels in a mixture of two moles of helium and n moles of hydrogen. If rms speed of gas molecules in the mixture is 2 times the speed of sound, then the value of n will be
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A tunning fork of frequency 480 Hz is used in an experiment for measuring speed of sound v in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, l1=30 cm and l2=70  cm. Then, ν is equal to:
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A particle is executing a simple harmonic motion. Its maximum acceleration is α and maximum velocity is β. Then, its time period of vibration will be:
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Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Sound travels fastest in
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Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A particle is executing SHM along a straight line. Its velocities at distances x1 and x2 from the mean position are V1 and V2 respectively. Its time period is:
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
The oscillation of a body on a smooth horizontal surface is represented by the equation, X=Acos⁡ωt, where X= displacement at time t, ω=  frequency of oscillation, a= acceleration at time t and T= time period.
Which one of the following graph shows correctly the variation a with t ?
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Let the speed of sound at 0 °C be 332 m s-1. On a winter day sound travels 342 m in one second. The atmospheric temperature on that day is
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
The pressure wave, P=0.01sin⁡1000t-3xN m–2 , corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is 0°C . On some other day when temperature is T , the speed of sound produced by the same blade and at the same frequency is found to be 336 m s–1 . Approximate value of T is:
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Consider a system of gas of a diatomic molecule in which the speed of sound at 0oC is 1260 m s-1 . Then, the molecular weight of the gas is in g mol-1, (given, the gas constant R is 8.314 J mol-1 K-1)