Question

The least count of stop watch is 0.1 sec. The time of 20 oscillation of pendulum is found to be 20sec. The % error in time period is???? Step by step plzzz

Answer 1

Explanation:

0.5% the answer was correct of the mates who first answer u

Answer 2

Answer:

The % error in the time period is 10%.

Explanation:

The least count will be the error in measurement of time i.e.

$\Delta T=0.1sec$             (1)

Time taken to complete 20 oscillations is 20 sec.

And we know that the time taken to complete one oscillation will be its time period. So,

$T=\frac{T_t}{N}$        (2)

Where,

T=time period of stopwatch

Tt=total time given to complete the given number of oscillations

N=number of oscillation

$T=\frac{20}{20}=1sec$     (3)

And the percentage error in the time period is given as,

$\frac{\Delta T}{T}\times 100$           (4)

By substituting the value of ΔT and T in equation (4) we get;

$\frac{0.1}{1}\times 100=10\%$

Hence, the % error in the time period is 10%.