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The period of a simple pendulum is doubled when
  • a)
    The mass of the bob and the length of the pendulum are doubled
  • b)
    The mass of the bob is doubled
  • c)
    Its length is increased four times
  • d)
    Its length is doubled
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The period of a simple pendulum is doubled whena)The mass of the bob a...
The Period of a Simple Pendulum
The period of a simple pendulum is determined by the formula:
T = 2π√(L/g)
where:
- T is the period
- L is the length of the pendulum
- g is the acceleration due to gravity
Understanding the Influence of Length on Period
- The period T is directly proportional to the square root of the length L.
- This means if you increase the length L, the period T increases.
Explaining the Correct Answer (Option C)
- If the length of the pendulum is increased four times (L becomes 4L), the new period T' can be calculated as follows:
T' = 2π√(4L/g) = 2π√(4)√(L/g) = 2 * 2π√(L/g) = 2T
- This shows that the period T' is now doubled.
Analysis of Other Options
- Option A: Doubling mass and length does not double the period. The mass does not impact the period; it only affects the amplitude.
- Option B: Doubling the mass of the bob does not change the period at all; it remains T.
- Option D: Doubling the length (L becomes 2L) results in:
T' = 2π√(2L/g) = √2 * T (not doubled).
Conclusion
Thus, the only scenario where the period of a simple pendulum is doubled is when its length is increased four times, making Option C the correct answer.
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