Tag: sound as a wave of disturbance

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

The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as

  1. Transverse wave

  2. Propagated waves

  3. Longitudinal waves

  4. Stationary waves
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In transverse waves, particle of the medium vibrate in a direction perpendicular to the direction of wave motion.

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves
State whether the given statement is True or False :
The ripples in water waves are created by the oscillatory movement of water particles.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We know that a transverse wave consists of successive crests and troughs. In a  transverse wave, the particles of the medium oscillate in a direction perpendicular to the direction of propagation.

We can easily see that the ripples in water are transverse in nature. They are created due to the oscillation of the water particles.

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

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

  1. Longitudinal

  2. Transverse

  3. Sometimes longitudinal and sometimes transverse

  4. Electromagnetic
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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)

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

Transverse mechanical wave can travel in :

  1. Iron rod

  2. Hydrogen gas

  3. Water

  4. Stretched string
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
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.

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

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

  1. $10 ^ { 7 }/ N/m^2$
  2. $10 ^ { 8 }/ N/m^2$
  3. $10 ^ { 9 }/ N/m^2$
  4. $10 ^ { 10 }/ N/m^2$
Reveal answer Fill a bubble to check yourself
A Correct answer
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}$