A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2016 · Q51 Mark
A student determines the density ρ of steel by taking measurements from a steel wire. mass m = 6.2 ± 0.1 g length l = 25.0 ± 0.1 cm diameter d = 2.00 ± 0.01 mm He uses the equation ρ = 4m / (πd²l) What is the percentage uncertainty in his calculated value of density?
A1.1%
B1.8%
C2.5%
D3.0%
✓ Correct answer
D: 3.0%
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