Tag: sound waves are longitudinal waves

Questions Related to sound waves are longitudinal waves

Which one of following is not a longitudinal wave?

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

  1. Ultrasonic wave

  2. Infrasonic wave

  3. Infrared wave

  4. Seismic wave

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Correct Option: C
Explanation:

Ultrasonic wave , Infrasonic wave and Seismic wave are longitudinal waves

Infrared wave is Transverse wave
Therefore Infrared wave is not a longitudinal wave
Therefore correct option is $C$

Velocity of a transverse wave along a stretched string is proportional to ___________. (T=tension in the string).

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

  1. $\sqrt{T}$

  2. $\displaystyle T$

  3. $\displaystyle\frac{1}{\sqrt T}$

  4. $\displaystyle\frac{1}{T}$

Show answer
Correct Option: A
Explanation:

Velocity of transverse wave $v =\sqrt{\dfrac{T}{\mu}}$

where $T$ is the tension in the string and $\mu$ is the mass of string per unit its length.
$\implies$ $v \propto \sqrt{T}$

All waves can be classified into two categories which are

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

  1. Sound waves and electromagnetic waves

  2. Transverse waves and electromagnetic waves

  3. Longitudinal waves and electromagnetic waves

  4. Transverse waves and longitudinal waves

Show answer
Correct Option: D
Explanation:

All waves can be classified into two categories . They are Transverse and longitudinal waves

A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves.
A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves
Therefore option $D$ is correct

Transverse nature of light was confirmed by the phenomenon of the

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

  1. refraction of light

  2. diffraction of light

  3. dispersion of light

  4. polarization of light.

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Correct Option: D
Explanation:

The phenomenon of polarization confirms that light is a transverse wave because for polarization, the light should have different components oscillating in the different planes and a transverse wave has the oscillations perpendicular to the direction of propagation of the wave.

Chronometer is?

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

  1. An clock for determining the longitude of a vessel at sea

  2. An instrument for changing or reversing the direction of electric current

  3. An instrument for measuring the direction and velocity of wind

  4. An instrument for comparing intensities of colours

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Correct Option: A
Explanation:

Chronometer is an instrument for measuring time accurately in spite of motion or variations in temperature, humidity, and air pressure.So it can be used a a clock for determining the longitude of a vessel at sea.

Which of the following statements is true?

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

  1. Pressure undergoes no change at the nodes in the case of longitudinal stationary waves

  2. Pressure is minimum at the nodes in the case of longitudinal stationary waves

  3. Pressure is maximum at nodes in the case of longitudinal stationary waves

  4. None of the above

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Correct Option: C
Explanation:

At nodes in longitudinal waves,there is maximum compression, So, there will be pressure.

Transverse waves can propagate

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

  1. only in solid

  2. both in solid and gases

  3. neither in solid nor in gases

  4. only in gases

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Correct Option: A

When source and detector are stationary but the wind is blowing at speed ${ v } _{ w }$, the apparent wavelength ${ \lambda  }'$ on the wind side is related to actual wavelength ${ \lambda  }$ by [take speed of sound in air as v]

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

  1. ${ \lambda }'={ \lambda }$

  2. ${ \lambda }'=\frac { { v } _{ w } }{ v } \lambda $

  3. ${ \lambda }'=\frac { { v } _{ w }+v }{ v } \lambda $

  4. ${ \lambda }'=\frac { v }{ v-{ v } _{ w } } \lambda $

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Correct Option: C

Equation of a longitudinal wave is given as $y=106{-2}\sin 2\pi\left(1000t+\dfrac{50x}{17}\right)$ (all SI units). At $t=0$, change in pressure is maximum (in modulus) at x$=$.

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

  1. $0.34$

  2. $0.255$

  3. $0.085$

  4. All of these

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Correct Option: A

Assertion - Sound wave is an example of longitudinal wave.
Reason - In longitudinal waves, the constituents of the medium oscillate perpendicular to the direction of wave propagation.

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

  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

  3. Assertion is correct but Reason is incorrect

  4. Both Assertion and Reason are incorrect

Show answer
Correct Option: C
Explanation:

A sound wave is an example of the longitudinal wave.
But in longitudinal waves, the constituents of the medium oscillate parallel to the direction of wave propagation. So sound wave is an example of longitudinal wave.