Tag: study of sound

Questions Related to study of sound

When we pluck the wire of a sitar, the waves produced in the wire are

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

  1. Longitudinal

  2. Transverse

  3. Sometimes longitudinal and sometimes transverse

  4. Electromagnetic

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Correct Option: B
Explanation:

A transverse wave is a moving wave that consists of oscillations occurring perpendicular (or right angled) to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the yz plane. In any pluck string instrument we are actually doing the same.

A transverse wave is a wave that consists of oscillations that are 

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

  1. parallel to the direction of wave propagation

  2. perpendicular to the direction of wave propagation

  3. radial to the direction of wave propagation

  4. none of the above

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Correct Option: B
Explanation:

A transverse wave is a wave that consists of oscillations that are perpendicular to the direction of wave propagation

The correct option is (b)

A loaded spring produces __________ waves.

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

  1. Transverse

  2. Longitudinal

  3. Both (A) and (B)

  4. None of the above

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Correct Option: B
Explanation:

loaded spring  applies force only in axial direction of the spring and the movement is also axial so the waves produced are longitudinal waves.

so the answer is B.

In a transverse wave, the distance between a crest and the immediate trough is $\frac{\lambda}{2}$.

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

  1. True

  2. False

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Correct Option: A
Explanation:

the distance between two either consecutive troughs or troughs is called wavelength and between a trough and a immediate crest is half of wavelength .

so the answer is A.

Which property in a medium changes, when a longitudinal wave passes through it

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

  1. Pressure

  2. Mass

  3. Velocity

  4. Acceleration

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Correct Option: A
Explanation:

The pressure in a medium varies as a longitduinal wave passes through the medium

The correct answer is (a)

Transverse mechanical wave can travel in :

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

  1. Iron rod

  2. Hydrogen gas

  3. Water

  4. Stretched string

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Correct Option: A,C,D
Explanation:

Transverse wave is that wave which vibrate the particles of medium in the medium in the $\bot $ar direction to the direction of wave propegation.

Exp :-    $\left( 1. \right) $ A wave on string.
             $\left( 2. \right) $ Ripples on water waves.
             $\left( 3. \right) $ EM wave.
             $\left( 4. \right) $ In metals like iron rod.

In brass, the velocity of longitudinal waves is $100\ times$ the velocity of transverse waves. If $Y = 1 \times 10 ^ { 11 }\ N/m^2,$ then the stress in the wire is

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

  1. $10 ^ { 7 }/ N/m^2$

  2. $10 ^ { 8 }/ N/m^2$

  3. $10 ^ { 9 }/ N/m^2$

  4. $10 ^ { 10 }/ N/m^2$

Show answer
Correct Option: A
Explanation:

Velocity of transverse wave ${V _T} = \sqrt {\left( {\frac{T}{m}} \right)} $

${V _T} = \sqrt {\left{ {\frac{T}{{\left( {\pi {r^2}\rho } \right)}}} \right}} .............\left( 1 \right)$
Velocity of longitudinal wave ${V _L} = \sqrt {\frac{Y}{\rho }} ...............\left( 2 \right)$
Given:
$\begin{array}{l} { V _{ L } }=100{ V _{ T } } \ \therefore \sqrt { \frac { Y }{ \rho  }  } =100\sqrt { \left{ { \frac { T }{ { \left( { \pi { r^{ 2 } }\rho  } \right)  } }  } \right}  }  \ \therefore Y={ \left( { 100 } \right) ^{ 2 } }\times \left{ { \frac { T }{ { \left( { \pi { r^{ 2 } } } \right)  } }  } \right}  \end{array}$
As stress $ = \left{ {\frac{{\left( {force} \right)}}{{\left( {area} \right)}}} \right} = \left{ {\frac{T}{{\left( {\pi {r^2}} \right)}}} \right}$
$\therefore Y = {10^4} \times $stress
$\therefore$ stress $ = \left( {\frac{Y}{{{{10}^4}}}} \right) = \left{ {\frac{{\left( {1 \times {{10}^{11}}} \right)}}{{\left( {{{10}^4}} \right)}}} \right} = 1 \times {10^7}\,\,N/{m^2}$

A wave moving in a gas

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

  1. must be longitudinal

  2. may be longitudinal

  3. must be transverse

  4. may be transverse

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Correct Option: A

Longitudinal waves do not exhibit ?

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

  1. Refraction

  2. reflaction

  3. Diffraction

  4. Polarization

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Correct Option: D

Choose the correct options for longitudinal wave

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

  1. maximum pressure variation is BAk

  2. maximum density variation is pAk

  3. pressure equation and density equation are in phase

  4. pressure equation and displacement equation are out of phase

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Correct Option: C