Hot Chocolate Experiment
Have you ever stirred your hot chocolate and noticed that the pitch increases as you continue to tap? Here are recordings of the tapping sound under different conditions.
Condition #1: Does the cup's composition impact the change in pitch?
Here we tested 3 different kinds of cups: a normal-shaped one, a wide one, and a tallish plastic one.
Null Hypothesis: There is no substantial difference in the tapping pitch characteristics among different kinds of mugs.
Here are recordings of what the tapping sounded like for each cup when the mug was filled with fresh cocoa:
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