Tag: study of sound

Questions Related to study of sound

Sound waves in air are

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. transverse

  2. longitudinal

  3. electromagnetic

  4. polarised

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Correct Option: B
Explanation:

Sound waves are longitudinal waves because the disturbance of the medium particles is parallel to the direction of propagation of wave. The compression and rarefraction pulses produced moves in the direction parallel to the propagation direction of wave.

A tuning fork is excited by striking it with a padded hammer. What would be the nature of the vibrations executed by the prongs as well as the stem of the fork respectively ? (The reference direction is that of the propagation of the sound wave.)

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. Both vibrate longitudinally

  2. Both vibrate transversely

  3. The prong vibrate longitudinally whereas the stem vibrates transversely

  4. The prong vibrate transversely whereas the stem vibrates longitudinally

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Correct Option: C

Which of the following is the longitudinal wave?

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. Sound waves

  2. Waves on plucked string

  3. Water waves

  4. Light waves

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Correct Option: A
Explanation:

In sound waves vibration of particle is along the propagation of wave So it is longitudinal and in other options all are transverse wave as vibration of particle is perpendicular to the propagation of wave.  

Consider the following statement:
(a) Sound waves are longitudinal in nature.
(b) Sound waves cannot travel through vacuum.
(c) Sound waves are produced by oscillating charged particles only.
(d) Sound waves are electromagnetic waves.
Which of the following statements are correct ?

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. (a) and (b)

  2. (b) and (c)

  3. (a), (b) and (d)

  4. (a),(b),(c) and (d)

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Correct Option: A
Explanation:

Sound waves are longitudinal waves. It needs a medium to propagate. Sound waves are example of mechanical waves, not electromagnetic waves. Electromagnetic waves are created by the vibration of an electric charge.

A longitudinal waves consists of

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. crest and troughs in the medium

  2. compressions and rarefactions in the medium

  3. crest and troughs in vacuum 

  4. Both A and B

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Correct Option: B
Explanation:

Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. Longitudinal waves are also called compression waves or compression waves, because they produce compression and rarefaction when traveling through a medium.  In longitudinal waves, the displacement of the particle's is parallel to the propagation of the wave. 

In case of longitudinal waves, the particles of medium vibrate

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. in the direction of wave propagation

  2. opposite to the direction of wave propagation

  3. at right angles to the direction of wave propagation

  4. none of the above

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Correct Option: A
Explanation:

Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as the direction of travel of the wave. Longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium.

Longitudinal waves are also called

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. Rarefactional waves

  2. Compressional waves

  3. Sound waves

  4. Light waves

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Correct Option: B
Explanation:

Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motion of the particles is parallel to the direction of the energy transport. This is what characterizes sound waves in air as longitudinal waves.
Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. Longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium.  In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave.

The longitudinal wave can be observed in

physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

  1. Elastic media

  2. inelastic media

  3. Both $(1)$ & $(2)$

  4. None of these

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Correct Option: A
Explanation:

Longitudinal waves travel only in the elastic medium. These waves comprise of compressions and rarefactions. The speed of Longitudinal waves is given by :

$v=\dfrac{\sqrt{B}}{\rho }$ where B is the bulk modulus of elasticity and $\rho $ is the density of the medium

A transverse wave along a string is given by y=$2\sin \left( {2\pi \left( {3t - x} \right) - \frac{\pi }{6}} \right)$, where x and y are in cm and 't' is in second. The acceleration of a particle located at x=4cm at t =1s is 

physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

  1. $36\pi ^2$

  2. $72\pi ^2$

  3. $18\pi ^2$

  4. $12\pi ^2$

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Correct Option: A

The waves propagating on water surface are

physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

  1. ultrasonic

  2. longitudinal

  3. unaudible

  4. transverse

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Correct Option: B,D
Explanation:

The answers are (B) and (D).

The waves on the surface of the water are neither longitudinal nor transverse.The wave on the water surface is the superposition of transverse and longitudinal motions of the molecules.