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Question
If a longitudinal wave is travelling in the west direction, what can be the possible direction of the vibration of particles of the medium?
Options:
A .  East-west
B .  Up-down
C .  North-south
D .  Medium needs to be specified
Answer: Option A
:
A
In a longitudinal wave, particles of the medium vibrate parallel to the direction of wave propagation. As the given wave is travelling in the west direction, the particles will also vibrate along the east-west direction.

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