In a progressive wave travelling through a medium, which statement is correct?

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1. In a progressive wave travelling through a medium, which statement is correct?

All particles of the medium vibrate, with the same amplitude for every particle

Only some particles of the medium vibrate at all

Every particle vibrates, but different particles can have different amplitudes

No particle in the medium actually vibrates

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In an ideal progressive wave, every particle of the medium vibrates with the same amplitude, each slightly out of phase with its neighbours as the wave passes through.