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Q.

Assertion (a) : tuning fork has two prongs only
Reason (R) : While vibrating tuning fork of two prongs their centre of mass always remains at same point and no external force is needed to maintain vibrations

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a

A and R are true but R is not a correct explanation of A.

b

A is false but R is true

c

A is true but R is false

d

A and R are true and R is correct explanation of A.

answer is A.

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Assertion (a) : tuning fork has two prongs onlyReason (R) : While vibrating tuning fork of two prongs their centre of mass always remains at same point and no external force is needed to maintain vibrations