Question

Melissa and Veni took turns to use the same stopwatch to measure the time
taken for a pendulum to make 20 oscillations. Melissa recorded a time of
30.2 s while Veni recorded a time of 29.8 s.
(a)
Why was there a difference in their recorded times?
​

Answer 1

Answer:

Number of oscillations n=20

Time taken =25 s

∴ Time period of oscillation T=

20

25

=1.25 s

Given :

Error in time for 20 oscillations, ΔT=0.2 s

Hence error in time for 1 oscilations, ΔT

′

=

n

0.2

= s

∴ Percentage error =

T

ΔT

×100=

20×1.25

0.2

×100=0.8 %

Explanation:

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