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Question at position 7  In lab, suppose you need to estimate the period1 of a pendulum for a certain amplitude2, say 10­o. You measure the period with a stopwatch 10 times, compute the mean period, and use that as your best estimate. In this experiment, which of the following are experimental uncertainties that can be revealed by repeating measurements?(Select all choices that apply.) 1The period of a pendulum is the amount of time the pendulum takes to swing back and forth once. 2The amplitude of the swing is the maximum angle that the pendulum sweeps out. The uncertainty caused by the stopwatch being improperly calibrated so that your measured times are always 1% greater than what they actually are.The uncertainty caused by random vibrations in the table on which you placed pendulum.The uncertainty caused by turbulent air currents in the lab room.The uncertainty caused by erroneously always starting the pendulum at 12 degrees instead of 10 degrees. The uncertainty caused by the random variations in your reaction time when stopping and starting the stopwatch.

选项
A.The uncertainty caused by the stopwatch being improperly calibrated so that your measured times are always 1% greater than what they actually are.
B.The uncertainty caused by random vibrations in the table on which you placed pendulum.
C.The uncertainty caused by turbulent air currents in the lab room.
D.The uncertainty caused by erroneously always starting the pendulum at 12 degrees instead of 10 degrees.
E.The uncertainty caused by the random variations in your reaction time when stopping and starting the stopwatch.
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思路分析
We start by restating the question in our own words to set the context: You are estimating the period of a pendulum for a fixed amplitude, taking 10 stopwatch measurements, computing the mean, and considering which uncertainties are revealed by repeating measurements. You are given a list of uncertainties and must identify which are revealed by repetition and which are not. Option 1: The uncertainty caused by the stopwatch being improperly calibrated so that your measured times are always 1% greater than what they actually are. - This describes a systematic error: a bias that consistently shifts all measurements in the same direction. Repeating mea......Login to view full explanation

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