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Make a cone using poster paper or cardboard and adhesive tape. Cover a mobile phone playing music with the cone and compare the loudness with and without it. Use an app to measure the sound in both cases, try different shapes, and record your observations.
View Sample Response
The cone channels and reinforces the sound in one direction, so the measured loudness is higher with the cone. Narrower or longer cones focus the sound differently — record the dB readings for each shape.
