question_answer 66)

                  Time for 20 oscillations of a pendulum is measured as \[{{t}_{1}}=39.6\,s;\,{{t}_{2}}=39.9\,s;\,{{t}_{3}}=39.5\,s\]. What is the precision in the measurement? What is the accuracy of the measurement?                

Answer:

                  Precision = least count of the instrument to measure the physical quantity.                 In this case, time is measured upto \[\frac{1}{10}s\]                 = 0.1 s in every measurement.                 \ Precision for measuring time of 20 oscillations                 = 0.1 s.