A student measures the length of a copper wire three times with a metre scale whose…
PHYSICS · Multi-part · CBSE · Physics · Units and Measurements · Units and Measurements
Problem
A student measures the length of a copper wire three times with a metre scale whose least count is 1 mm. The readings obtained are 75.42 cm, 75.3 cm, and 75.425 cm.
(a) Express each individual reading in scientific notation, retaining the correct significant figures.
(b) Calculate the mean length of the wire and write the result in scientific notation with the appropriate number of significant figures.
(c) State and justify the rule you have applied to decide the number of significant figures in the mean value obtained in part (b).