Which of the following statement(s) is/are incorrect for mechanical waves? (a) These waves requi...

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Which of the following statement(s) is/are incorrect for mechanical waves?
(a) These waves require a medium for propagation, they cannot propagate through vacuum.
(b) They involve oscillations of constituent particles.
(c) They depend on the elastic properties of the medium.
(d) They have the same speed in all the media.
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