Answer the following questions about unit and prefix conversions
PHYSICS · Subjective · A Level · Physics · Measurements and their errors · Measurements and their errors
Problem
Answer the following questions about unit and prefix conversions.
(a) A copper wire has a diameter of 0.25mm. Write this diameter in metres in scientific notation and state the number of significant figures in your answer.
(b) The resistivity of copper is 1.72×10−8Ωm. Express the same physical quantity in μΩcm in scientific notation, retaining three significant figures.
(c) Briefly explain how the rules of significant figures have been applied in parts (a) and (b).