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Which of the following statements is/are correct regarding the sound waves? 1) Sound waves cannot travel through a vacuum. 2) The particles oscillate up and down about their mean position as the wave travels. 3) In a given medium under the same physical conditions, the speed of sound changes drastically with a change in frequency. Select the correct answer using the code given below.

Which of the following statements is/are correct regarding the sound waves? 1) Sound waves cannot travel through a vacuum. 2) The particles oscillate up and down about their mean position as the wave travels. 3) In a given medium under the same physical conditions, the speed of sound changes drastically with a change in frequency. Select the correct answer using the code given below. Correct Answer <span style="">1 only</span>

CONCEPT:

  • Sound: A sound is a form of energy that produces the sensation of hearing in our ears.
    • When a source of sound vibrates, it creates a disturbance in the medium. The particles of the medium vibrate in their mean position to transfer this disturbance.
    • So, the particles move forward and backwards about their mean position, creating regions of compression and rarefaction.
    • Hence, a sound wave travels in a series of compression and rarefactions.
    • Due to the nature of the transfer of sound energy, sound always requires a medium to propagate.

The correct answer is 1 only.

EXPLANATION:

  • Sound is a mechanical wave and needs a material medium like air, water, steel, etc. for its propagation.
  • It cannot travel through a vacuum. Hence statement 1st is correct.
  • In these waves, the individual particles of the medium move in a direction parallel to the direction of propagation of the disturbance.
  • The particles do not move from one place to another but they simply oscillate back and forth about their position of rest.
  • This is exactly how a sound wave propagates, hence sound waves are longitudinal waves. 
  • Hence statement 2nd is incorrect.
  • The speed of sound remains almost the same for all frequencies in a given medium under the same physical conditions. Hence statement 3rd is incorrect.

Hence option 1 is correct.

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