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Sound travels through the air by spreading out in invisible waves. These are
called ‘Sound Waves’. If you fire a sound wave at a target, what will happen
when the sound hits it?
- Thin Plastic (from a plastic bag)
- Stiff paper
- Cardboard tube
- Strip of paper (20cm long, 1 cm wide)
- Rubber band
- Sticky tape
- Use the tube to draw a circle on the piece of stiff paper.
- Cut out the circle (be as accurate as you can).
- Make a hole in the centre of the circle with the point of the pencil. (The
hole should remain small, approximately half the thickness of the pencil)
- Tape the circle firmly to one end of the tube (If there are large gaps
around the edge of the circle, block using sticky tape).
- Cover the other end of the tube with the thin plastic, as if you were
making a drum, secure the plastic using the rubber band.
- Fold the strip of paper in half and tape one end to a table. Ensure the
other end is sticking up in the air.
- Hold the tube so that the hole is pointing at the top of the paper strip,
and sharply tap the drum end.
What happens to the piece of paper? Why?