JEE Main 202122 Jul, Evening shiftPhysicsHardUnits and Measurements122× since 2002
Three students S₁, S₂ and S₃ perform an experiment for determining the acceleration due to gravity (g) using a simple pendulum. They use different lengths of pendulum and record time for different number of oscillations. The observations are as shown in the table.
Student
No. | Length of
Pendulum (cm) | No. of
oscillations (n) | Total time for
n oscillations | Time
period (s)
1 | 64.0 | 8 | 128.0 | 16.0
2 | 64.0 | 4 | 64.0 | 16.0
3 | 20.0 | 4 | 36.0 | 9.0
(Least count of length = 0.1 cm and Least count for time = 0.1 s)
If E₁, E₂ and E₃ are the percentage errors in 'g' for students 1, 2 and 3 respectively, then the minimum percentage error is obtained by student no. ______________.