Assertion: The periodic time of a hard spring is less as compared to that of a soft spring.Reason: The periodic time depends upon the spring constant, and spring constant is large for hard spring

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Detailed Solution

The time period of a oscillating spring is given by, T = 2ππk ⇒ T ∝1k. Since the spring constant is large for hard spring, therefore hard spring has a less periodic time as compared to soft spring.

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