A wave moving in a gas
(a) must be longitudinal
(b) may be longitudinal
(c) must transverse
(d) may be transverse.

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Solution

(a) must be longitudinal

Because particles in a gas are far apart, only longitudinal wave can travel through it.

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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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