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When a pebble is dropped into a pond of still water, what happens?

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in Engineering Physics I by (558k points)
When a pebble is dropped into a pond of still water, what happens?

(a) Particles move

(b) Waves move

(c) The pebble moves

(d) Water moves

The question was posed to me in final exam.

Origin of the question is Waves topic in division Quantum Physics of Engineering Physics I

1 Answer

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Correct answer is (b) Waves move

The explanation: When a pebble is thrown in still water, a circular pattern of alternate crests spread out. The kinetic energy makes the particles to oscillate which comes in contact with it. The energy gets transferred to the particles of the next layer which also begins to oscillate. Thus it is the disturbance or waves that move forward and not the particles of the medium.

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