To reduce the uncertainty in the timing experiment______________?
Correct answer: D. Both a and C
- A. Highly precise instrument
- B. Conduct at room temperature
- C. Count number of vibration
- D. Both a and C
Explanation
If the time for one vibration is uncertain by an amount Δt, timing many vibrations gives a total time of NΔt, while the fractional uncertainty in the average period becomes smaller by averaging. A highly precise instrument also reduces instrumental uncertainty, so both A and C are useful. Students may choose C alone because counting more vibrations is the usual timing improvement, but it ignores instrument precision.
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