Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

Mark the correct statement

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. Hard surfaces are good reflectors of sound

  2. Soft surfaces are poor reflectors of sound

  3. Bad reflectors of sound are good absorbers of sound

  4. All the above are true

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Correct Option: D
Explanation:

Sound is not reflected equally from different materials. Hard surfaces reflect more sound. Hard surfaces are good reflectors of sound. 
Soft or porous surfaces are poor reflectors of sound. Bad reflectors of sound are good absorbers of sound. These sound absorbing materials are used to cover walls, ceilings etc.

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. When a table is striked lightly,vibrations are produced with less amplitude

  2. When the table is strikes hard,the amplitude is high

  3. Both

  4. None

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Correct Option: C
Explanation:

If we strike a table lightly the vibrations produced have less amplitude than when we strike the table hard. Since loudness depends on amplitude, soft sound is heard when we strike lightly.

By studying sound waves, we may come to know about its:

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. amplitude only

  2. frequency and wavelength Only

  3. amplitude, frequency and wavelength

  4. amplitude and wavelength only

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Correct Option: C
Explanation:

By studying sound waves, we may come to know about its amplitude, frequency and wavelength.

Which are the two properties that affect wave speed ?

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. Inertial properties and elastic properties

  2. Mass properties and elastic properties

  3. Inertial properties and bending properties

  4. Bending properties and elastic properties

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Correct Option: A
Explanation:

In a wave, particles are moving from one place to another and again come back to the same place due to inertial properties and due to elastic properties  the wave vibrates. 

The motion that is repeated at regular intervals is termed as

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. Vibration

  2. Ventilation

  3. Oscillation

  4. Periodic Motion

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Correct Option: D
Explanation:

Periodic Motion  is repeated at regular intervals

Which of the following is not a characteristics of mechanical waves? 

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. They consist of disturbances or oscillations of a medium 

  2. They transport energy.

  3. They travel in a direction that is at right angles to the direction of the particles of the medium. 

  4. They are created by vibrating source. 

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Correct Option: C
Explanation:

All of the above are the characteristics except mechanical waves travel in a direction that is at right angles to the direction of the particles of the medium. 

Find out the relationship between the frequency and amplitude of a sound wave?

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. Frequency is proportional to amplitude

  2. Frequency is proportional to the square of the amplitude

  3. Frequency is inversely proportional to amplitude

  4. Frequency is inversely proportional to the square of the amplitude

  5. Frequency and amplitude are independent

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Correct Option: E
Explanation:

Frequency of a wave is $f=1/T$ where T be the time period of the wave.

As time period does not depend on the amplitude so frequency is also independent of amplitude.  

Sound waves cannot travel in:

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. air

  2. metal

  3. vacuum

  4. water

  5. wood

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Correct Option: C
Explanation:

Sound waves are mechanical waves and we know from the properties of mechanical waves that they require medium to propagate , therefore sound waves cannot travel in vacuum.

Compressional wave among the following is?

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. X-ray

  2. Cosmic ray

  3. Radio wave

  4. Light wave

  5. Sound wave

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Correct Option: E
Explanation:

X-ray, cosmic ray, radio wave, light wave, they all  are electromagnetic waves and we know that an electromagnetic wave is always  a transverse wave, on the other hand sound wave is a mechanical longitudinal wave which propagates in a medium with compressions and rarefactions. Therefore, sound wave is a compressional wave among them.

Sound waves do not exhibit polarization because, unlike light waves, they are not:

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. longitudinal

  2. coherent

  3. dispersive

  4. transverse

  5. refractive

Show answer
Correct Option: D
Explanation:

In polarization the vibrations of electric vector of light are restricted by a polariser in a single plane  because vibrations are perpendicular to the propagation of light ,  as light is a transverse wave .
Polarization is the phenomenon of transverse waves only , it does not happen in longitudinal waves  , as sound waves are longitudinal waves in which vibrations are in the direction of propagation of wave so they pass the polariser without any change and doesn't experience any polarization .