Problem from Online Quiz 1

The measured length of a cylindrical laser beam is 12.1 meters, its measured diameter is 0.00121 meters, and its measured intensity is 1.21 × 10⁵ W/m² . Which of these measurements is the most precise?

Solution:
Uncertainty of the measurement result of 12.1 m is 0.05 m so the precision can be shown by the relative error of 0.05m / 12.1m = 0.05/12.1

Uncertainty of the measurement result of 0.00121 m is 0.000005 m so the precision can be shown by the relative error of 0.000005m / 0.00121m = 0.05/12.1

Uncertainty of the measurement result of 1.21 × 10⁵ W/m² is 0.05 × 10⁵ W/m² so the precision can be shown by the relative error of (1.21 × 10⁵ W/m² ) / (0.05 × 10⁵ W/m²) = 0.05/12.1

As relative errors are the same then precision levels are the same.

PHY 215 Quiz 1 (eztestonline.com/695230/14274823527240100.tp4) Is Closed for Records. Nothing Recorded

PHY 215 Quiz 1 (eztestonline.com/695230/14274823527240100.tp4) is closed for records. Nothing recorded.