Question

true value of length of a wooden stick is a 38.762 its length is measured by using two different instrument of different least count measurement results are 38.763 centimetre and 38.76 respectively which of the following is correct

Answer 1

Answer:

38.763 cm

Explanation:

The instrument which have small least count can able to measure with more accuracy.

NOW

Reading are

1)    38.763

2)    38.76

The digits after point or decimal digits indicates the accuracy of instrument

In first case reading have 3 decimal digits that is 3 digits after point

and in second case there are 2 digits after point

So

first instrument has least count 0.001 cm

and

second instrument has least count 0.01 cm

Thus

first reading is more appropriate then second one

Therefor

Correct answer is 38.763 cm