Question

multiple choice question
an example of a scientific measurement when determining the period of a pendulum is
o a second as measured by a stopwatch
o the number of seconds to perform ten oscillations
o a list of the items required for the experiment
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Explanation:

The period of a pendulum is the time taken for one complete oscillation. Measuring the time for ten oscillations and then dividing by ten gives a more accurate value for the period than just measuring one - second with a stopwatch. A list of items for the experiment is not a measurement of the period.

Answer:

the number of seconds to perform ten oscillations