A student uses simple pendulum of exactly 1 m length to determine g, the acceleration due to gravity. He uses a stopwatch with the least count of 1 s for this and records 40 s for 20 oscillations. Which of the following statement(s) is/are correct?

Q: A student uses simple pendulum of exactly 1 m length to determine g, the acceleration due to gravity. He uses a stopwatch with the least count of 1 s for this and records 40 s for 20 oscillations. Which of the following statement(s) is/are correct?

(a) Error ΔT in measuring T, the time period is 0.05 s

(b) Error ΔT is measuring T, the time period is 1s

(c) Percentage error in the determination of g is 5%

(d) Percentage error in the determination of g is 2.5 %

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Ans: (a) , (c)