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Sound waves cannot be polarised as they are longitudinal. Light waves can be polarised as they are transverse.

1. Sound waves are transverse.
2. Light waves are longitudinal.
3. Sound waves can be polarised.
4. Light waves can be polarised.

Correct answer: Light waves can be polarised.

Solution

Sound waves are longitudinal and cannot be polarised because their oscillations occur in the direction of wave propagation. Light waves, being transverse, can be polarised as their oscillations are perpendicular to the direction of wave propagation.

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