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Which one of the following statements is true?

1. The sound waves in air are longitudinal while the light waves are transverse.
2. Both light and sound waves in air are longitudinal.
3. Both light and sound waves can travel in vacuum.
4. Both light and sound waves in air are transverse.

Correct answer: The sound waves in air are longitudinal while the light waves are transverse.

Solution

Sound waves in air are longitudinal, as they involve compressions and rarefactions in the medium. Light waves are transverse, as they consist of oscillating electric and magnetic fields perpendicular to the direction of propagation.

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