Tag: study of sound

Quizzes (14) Questions (314)

Questions Related to study of sound

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}$

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

Choose the correct options for longitudinal wave

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a longitudinal wave, the pressure variation and density variation are both proportional to the displacement gradient, causing them to be in phase with each other.