A wave moving in a gas

must be longitudinal

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may be longitudinal

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must be transverse

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may be transverse

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Solution

The correct option is A
must be longitudinal

Gases cannot provide restoring force in the transverse direction but due to fact that they can compress, a longitudinal wave becomes possible. It travels as pressure fluctuations.

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\begin{matrix} Column - I & Column - II (Nature of wave) & (Properties) (A) Transverse progressive wave & (P) Amplitude of all particles is same. (B) Longitudinal progressive wave & (Q) Phase of all the particles may be same. (C) Transverse standing wave & (R) May occur in gases. (D) Longitudinal standing wave & (S) KE and PE of a small element may be maximum \end{matrix}

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