Question

Why does the time for 20 complete oscillations need to be taken

Answer 1

✏Answer ✏

The short answer is to reduce the uncertainty in your measurement of the period. ... If you are using a stopwatch and manual timing- then your uncertainty in timing an interval is likeley to be about say 0.2 s . If the period of the pendulum is about 1 second then 0.2 s uncertainty corresponds to about 20% .

Explanation:

# Brainliest Bunch