Tag: physics

Questions Related to physics

How does sound from a sound producing body travel through air to reach our ears?

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

  1. through crest and troughs

  2. through compression and rarefaction

  3. both

  4. none

Show answer
Correct Option: B
Explanation:

Sound from a sound producing body travel through air to reach our ears by making regular compression and rarefaction.

How longitudinal waves are different from other waves?

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

  1. Particles of medium move in a direction parallel to direction of energy transport

  2. Particles of medium move in a direction perpendicular to direction of energy transport

  3. Particles of medium move in a direction below to direction of energy transport

  4. None

Show answer
Correct Option: A
Explanation:

Longitudinal waves are different from the others waves because in longitudinal waves particles of medium move in a direction parallel to direction of energy transport for longitudinal waves.

In a graphical presentation of longitudinal waves as attached, the peak of wave is called

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

  1. Compression

  2. Rarefaction

  3. Reflection

  4. Refraction

Show answer
Correct Option: A
Explanation:

Graphical representation of longitudinal waves is the variation of pressure (y-axis) with the distance (x-axis). We know that, the pressure is higher at the point where the element of medium is compressed and the pressure is low where the element of medium is rarefied.
So, the wave forms a pressure peak at compression and pressure valley at rarefaction.

Sound is a good example of

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. Both

  4. None

Show answer
Correct Option: B
Explanation:

Sound waves are longitudinal waves which require a material medium (solid, liquid or gas) to propagate. So, sound waves cannot pass through a perfect vacuum.

Which of the following is 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:

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.

In the graphical presentation as attached, what does the valley of wave known as

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

  1. Compression

  2. Rarefaction

  3. Reflection

  4. Deflection

Show answer
Correct Option: B
Explanation:

Graphical representation of longitudinal waves is the variation of pressure (y-axis) with the distance (x-axis). We know that, the pressure is higher at the point where the element of medium is compressed and the pressure is low where the element of medium is rarefied.
So, the wave forms a pressure peak at compression and pressure valley at rarefaction.

Which of the following is NOT a characteristic of longitudinal wave?

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

  1. Wavelength

  2. Amplitude

  3. Velocity

  4. None

Show answer
Correct Option: D
Explanation:

All of the above are characteristics of Longitudinal waves

If $l 1, l _2 $ and $l _3$ are wave lengths of the waves giving resonance with fundamental, first and second over tones of closed organ pipe. The ratio of wavelengths $l _1 : l _2 : l _3$ is _______.

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

  1. $1 : 2 : 3$

  2. $1 : \dfrac{1}{3} : \dfrac{1}{5}$

  3. $1 : 3 : 5$

  4. $5 : 3 : 1$

Show answer
Correct Option: A

The sound propagates in a gaseous medium by

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. Both (a) and (b)

  4. None of these

Show answer
Correct Option: B
Explanation:

For transverse wave, cohesion is an important property in the medium through which the wave energy can be transported. Gas does not have such a cohesion property. Hence there is no chance for transverse waves to be propagated through gas medium. So the sound propagates in a gaseous medium by longitudinal wave.

Fill in the blank. 

Sound waves in air are __________waves.

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

  1. Longitudinal

  2. Radial

  3. Transverse

  4. Electromagnetic

Show answer
Correct Option: A
Explanation:

Longitudinal waves are waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport. Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.