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Medium
Place a siren inside a box and swap the front panel between plywood, bakelite, glass, and marble to see which blocks the most sound.
Medium
Chill a tuning fork in a freezer, then heat it in stages up to boiling temperature and measure how the pitch shifts.
Hard
Drip seven liquids of different thickness from a burette and film how their droplet necks stretch before breaking free.
Hard
Freeze and heat a tuning fork from 0°C to 100°C and measure the subtle frequency shift that temperature creates.
Hard
Place helium balloons on different floors of a tall building and measure how fast they shrink as air pressure drops with height.
Hard
Photograph red, yellow, green, and blue balls at increasing ocean depths to discover which colors vanish first.
Hard
Aim red, green, and blue lasers through colored glass filters and measure whether any filter blocks a meaningful amount of power.
Hard
Shoot at the wrong aperture on purpose with three film speeds and measure which one handles the mistake best.
Hard
Tap a glass goblet to find its natural pitch, then match it with a loudspeaker until the glass shatters.
Hard
Mount 23 different spectacle lenses over a UV lamp and measure which material blocks the most ultraviolet light.
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