Directions : Each of these questions contain two statements, Assertion and Reason. Each of these...

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Directions : Each of these questions contain two statements, Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
Assertion : Speed of mechanical wave in the medium depends on the velocity of source, relative to an observer at rest.
Reason : Speed of mechanical wave is independent of the elastic and other properties such as mass density of the medium.
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