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STATEMENT - 1: The basic of Laplace correction was the exchange of heat between the region of compression and rarefaction in air is not possible. Because

STATEMENT - 2: Air is a bad conductor of heat and velocity of sound in air is large.

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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?
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases

A transverse wave propagating on a stretched string of linear density 3×10-4 kgm-1 is represented by the equation

y=0.2sin(1.5x+60t)

where, x in metres and t is in seconds. The tension in the string (in Newton) is

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:
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A uniform rope of length L and mass m1, hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2. The ratio λ2λ1 is:
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
Sound travels fastest in
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A string of length 1 m and mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration using an external vibrator of frequency 100 Hz. The separation between successive nodes on the string is close to
MEDIUM
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
A heavy ball of mass M is suspended from the ceiling of a car by a light string of mass m m≪M. When the car is at rest, the speed of transverse waves in the string is 60 m s-1. When the car has acceleration a, the wave-speed increases to 60.5 m s-1. The value of a  in terms of gravitational acceleration g is closed to:
EASY
Physics>Oscillations and Waves>Sound Waves>Speed of Sound in Gases
If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string 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)