Tag: physics

Questions Related to physics

Sound waves are transverse mechanical waves. State whether true or false.

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Sound waves are longitudinal mechanical waves.

Sound waves are

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. Transverse waves

  2. Longitudinal waves

  3. Ultrasonic waves

  4. Stationary waves

Show answer
Correct Option: B
Explanation:

Particles of the sound waves vibrate in the direction of wave. So it is characterized under longitudinal waves.

Fix up one end of a slinky to a hook and hold it horizontally. Vibrate the other end to and fro along the length of the spring. If you look the spring carefully , you will see some parts of the spring are pushed closer , while some other parts are pulled apart.

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. The portions which are pushed closer are called compressions

  2. The portions which are pulled apart are called rarefactions

  3. Both A and B are correct

  4. Neither of A and B is correct

Show answer
Correct Option: C
Explanation:

Compressions are the regions of high density and rarefactions are regions of low density.These compressions and rarefactions result because sound is able to reflect off fixed ends and interfere with incident waves vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations. 

Which of the following are true.

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. the sound and light waves both are longitudinal waves

  2. both the sound and light waves are transverse

  3. in air ,the sound waves are longitudinal as well as transverse

  4. in air, the sound waves are longitudinal and the light waves are transverse

Show answer
Correct Option: D
Explanation:

Longitudinal waves are always characterized by particle motion being parallel to wave motion. A sound wave travelling through air is a classic example of a longitudinal wave. Transverse wave moves perpendicular to the direction of wave motion. Light waves are transverse in nature.

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

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. transverse wave

  2. propagated waves

  3. longitudinal waves

  4. stationary waves

Show answer
Correct Option: A
Explanation:

The waves in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion is known as transverse wave. Examples of these waves are: vibrations in strings, ripples on water surface and electromagnetic waves.

Compressions and rarefactions are seen in

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. longitudinal and transverse waves

  2. longitudinal waves only

  3. transverse waves only

  4. none

Show answer
Correct Option: B
Explanation:

   Longitudinal waves propagate in a medium in the form of compressions and rarefactions . When pressure becomes high , medium particles come closer and a compression is formed and due to low pressure , rarefaction is formed .

  Transverse waves propagate in the form of crests and troughs .

Sound is called longitudinal wave because

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. sound need a material medium for propagation

  2. the molecules of the medium oscillate to and fro about their mean position in the direction of propagation

  3. sound waves moves in the direction of its production

  4. all reasons are correct

Show answer
Correct Option: B
Explanation:

When a sound travels through their medium, the molecules in the air oscillate to and fro about their mean positions in the direction of propagation of sound wave.

Compressions and rarefactions are seen in :

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. longitudinal and transverse waves

  2. longitudinal waves only

  3. transverse waves only

  4. none of these

Show answer
Correct Option: B
Explanation:

In case of longitudinal waves compressions and rarefactions are seen. Compressions are the regions of high density and rarefactions are regions of low density.In transverse waves generally crest and troughs are seen.

When vibrating string moves in reverse direction then

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. it lowers pressure to right

  2. it lowers pressure to left

  3. it lowers pressure to center

  4. it increases pressure to right

Show answer
Correct Option: A
Explanation:

When vibrating string moves in a reverse direction, the pressure due to the vibrant molecules lowers to right.

When sound travels through air, the air particles :

physics study of sound sound as a wave of disturbance vibrations in a tuning fork vibrations in tuning fork

  1. vibrate along the direction of wave propagation

  2. vibrate but not in any fixed direction

  3. vibrate perpendicular to the direction of wave propagation

  4. do not vibrate

Show answer
Correct Option: A
Explanation:

Sound is a longitudinal wave.  If the particles of a medium vibrate or oscillate to and fro about their equilibrium position along the direction of propagation of disturbance then the wave is called longitudinal wave.