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Regarding sound waves, consider two statements: (I) their vibrations are perpendicular to the wave’s direction of travel, and (II) sound waves are elastic waves, needing an elastic medium. Which is/are correct?

1. Regarding sound waves, consider two statements: (I) their vibrations are perpendicular to the wave’s direction of travel, and (II) sound waves are elastic waves, needing an elastic medium. Which is/are correct?

 

Sound waves are longitudinal, so their vibrations run parallel to, not perpendicular to, the direction of travel, making statement I false. Statement II is correct: sound needs an elastic medium to propagate.

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