Question

4. (5 points) Three students make measurements of the length of a 1.50 meter rod. Each student reports an uncertainty estimate representing an independent random error applicable to the measurement Alice A single measurement using a 2.0 meter long tape measure, to within +2 mm. Bob: Two measurements using a wooden meter stick, each to within t2 mm, which he adds together Christina: Two measurements using a machinist's meter ruler, each to within + mm, which she adds together. The students' teacher prefers measurements that are likely to have less error. Find the uncertainties and put them in the correct order of preference.

Answer 1

Alice's measurements have an uncertainty of ±2 mm, Bob's measurements have an uncertainty of ±4 mm and Christina's measurements have an uncertainty of ±2 mm, but Christina's measurements are the most accurate and least uncertain.