Tag: world of sounds

Questions Related to world of sounds

Characteristic of sound which enables us to distinguish between two sound of same loudness and pitch :

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

  1. quality

  2. timbre

  3. amplitude

  4. a and b

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Correct Option: D
Explanation:

 Quality is that characteristic of sound which enables us to distinguish between two sounds from two sources , even of the same frequency (pitch) and loudness . Quality is also called timbre . So option a and b are correct .

Sound is

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

  1. 1-D wave

  2. 2-D wave

  3. 3-D wave

  4. none

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Correct Option: C
Explanation:

Sound energy is transferred in space in all directions. So it is a 3-D wave. Light waves are 3-D wave.

Sound wave can be described graphically by

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

  1. velocity displacement graph

  2. displacement time graph

  3. density distance graph

  4. amplitude velocity graph

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Correct Option: C
Explanation:

A longitudinal wave, eg., Sound wave can be described by a density-distance graph. In density time graph, particle density of the medium is plotted on y axis where as time on the x axis

In density time graph

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

  1. particle density of the medium is plotted on y axis where as time on the x axis

  2. time on the y axis, particle density on x axis

  3. both a and b can be done interchangeably

  4. can't be plotted 

Show answer
Correct Option: A
Explanation:

The density time graph for a longitudinal wave is drawn by plotting the particle density on the medium at any point on the wave on the y axis against time on the x axis.

In wave motion particles of the medium

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

  1. move from one place to another

  2. do not move from one place to another

  3. vibrate about their mean positions

  4. vibrate away from their mean position

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Correct Option: C
Explanation:

When a wave passes through a medium, the particles of the medium vibrate according to the wave about the mean positions.

During a wave motion 

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

  1. no transfer of matter occurrs through the medium

  2. energy is transferred from one part of the medium to another

  3. both a and b occurs

  4. none of the above

Show answer
Correct Option: C
Explanation:

During a wave motion only energy is transferred no transfer of matter occurs through the medium. Only vibrations travels not the air.

Sound wave is a

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

  1. Mechanical wave

  2. Non mechanical wave

  3. Progressive wave

  4. a and c

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Correct Option: D
Explanation:

On the basis of necessity of medium, sound is a mechanical wave, because it needs a material medium for its transmission and on the basis of energy propagation, it is a progressive wave.

Peak of the density/Pressure - distance curve represent

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

  1. maximum rarefaction

  2. maximum compression

  3. minimum compression

  4. minimum rarefaction

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Correct Option: B
Explanation:

The peak represents the region of maximum compression. Thus, compressions are the regions where pressure/density is high.

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

Show answer
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.