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 #2: Does the cup's contents impact the change in pitch?
Here we tested 3 different kinds of liquids: hot water, water with cocoa, and water with cocoa after it's sat for a while.
Null Hypothesis: There is no difference in the tapping pitch characteristics among different kinds of liquids.
Here are recordings of what the tapping sounded like for each cup filled with different liquids:
Here is the wide mug with different liquids:
Here is the plastic mug with different liquids:
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