Sound wave are not polarized because:

Their speed is less

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A medium is needed for their propagation

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These are longitudinal

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Their speed depends on temperature

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Solution

The correct option is C These are longitudinal
Unlike transverse waves such as electromagnetic waves, longitudinal waves such as sound waves cannot be polarized. ... A polarized wave vibrates in a single plane in space. Since sound waves vibrate along their direction of propagation, they cannot be polarized.

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