Tag: vibrations in a tuning fork

Questions Related to vibrations in a tuning fork

Which of the following is true?

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

  1. The sound and light waves both are longitudinal waves

  2. Both the sound and light waves are transverse

  3. In air ,the sound waves are longitudinal as well as transverse

  4. In air, the sound waves are longitudinal and the light waves are transverse

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Correct Option: D
Explanation:

If the particles of a medium vibrate or oscillate to and fro about their equilibrium position along the direction of propagation of disturbance then the wave is called longitudinal wave.

In the graphical presentation as attached, what does the valley of wave known as

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

  1. Compression

  2. Rarefaction

  3. Reflection

  4. Deflection

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Correct Option: B
Explanation:

Graphical representation of longitudinal waves is the variation of pressure (y-axis) with the distance (x-axis). We know that, the pressure is higher at the point where the element of medium is compressed and the pressure is low where the element of medium is rarefied.
So, the wave forms a pressure peak at compression and pressure valley at rarefaction.

Which of the following is NOT a characteristic of longitudinal wave?

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

  1. Wavelength

  2. Amplitude

  3. Velocity

  4. None

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Correct Option: D
Explanation:

All of the above are characteristics of Longitudinal waves

If $l 1, l _2 $ and $l _3$ are wave lengths of the waves giving resonance with fundamental, first and second over tones of closed organ pipe. The ratio of wavelengths $l _1 : l _2 : l _3$ is _______.

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

  1. $1 : 2 : 3$

  2. $1 : \dfrac{1}{3} : \dfrac{1}{5}$

  3. $1 : 3 : 5$

  4. $5 : 3 : 1$

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Correct Option: A

The sound propagates in a gaseous medium by

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

  1. Transverse waves

  2. Longitudinal waves

  3. Both (a) and (b)

  4. None of these

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Correct Option: B
Explanation:

For transverse wave, cohesion is an important property in the medium through which the wave energy can be transported. Gas does not have such a cohesion property. Hence there is no chance for transverse waves to be propagated through gas medium. So the sound propagates in a gaseous medium by longitudinal wave.

Fill in the blank. 

Sound waves in air are __________waves.

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

  1. Longitudinal

  2. Radial

  3. Transverse

  4. Electromagnetic

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Correct Option: A
Explanation:

Longitudinal waves are waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport. Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

Sound does not exhibit the property of

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

  1. Reflection

  2. Doppler Effect

  3. Diffraction

  4. Polarization

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Correct Option: D
Explanation:

Polarization is exhibited only by Transverse waves. Sound waves being longitudinal do not exhibit this phenomenon. 

A uniform tub to length $60.5\,cm$ is held vertically with its lower end dipped in water. A sound source of frequency $500\,Hz$ sends sound waves into the tube. When it is $50\,cm$, the tube resonates with the source of sound. Two lowest frequencies (in Hz), to which tube will resonate when it is taken out of water, are (approximately)

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

  1. $281, 562$

  2. $281, 843$

  3. $276, 522$

  4. $272, 544$

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Correct Option: C

If wind blows in a direction opposite to the sound propagation, then the velocity of the sound

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

  1. increases

  2. decreases

  3. remains constant

  4. Cannot be determined

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Correct Option: B

A replica of longitudinal waves can be best observed 

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

  1. by swinging a pendulum

  2. by pressing and releasing a horizontal spring

  3. by striking a guitar string

  4. by rotating a top

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Correct Option: B
Explanation:

If we press and release a horizontal spring, it exhibits a confined motion of compression and rarefaction. So, it shows a replica of longitudinal waves. A swinging pendulum performs simple harmonic motion. A struck guitar string exhibits a replica of transverse waves. A rotating top exhibits rotational motion.