Wave Machine
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Wave Machine helps students to describe the nature of a wave in motion. It also makes them to relate the length of the medium to the wavelength. Working through this practice students also develop creativity and imaginative skills.
Help your child to prepare 20 straws, 40 paper clips, and 2 long pieces of tape.
Put down a long piece of tape on the ground with the sticky side facing upwards.
Draw a line down the centre of the tape using a permanent marker or a pen. Mark the line at equal intervals, i.e. every 4 centimetres.
Have your child stick the straws on top of the equal markings in a row, all facing in the same direction. This means that the straws should be perpendicular to the long piece of tape, with half of the straw on each side of the piece of tape.
Do this from the top to the bottom of the long piece of tape
until all of the straws are stuck.
Stick each end of the tape to a chair on each side. The length of the space between the two chairs depends on how long the piece of tape is. Put something heavy on top of the tape ends so that it doesn’t fall.
Lightly hit one end of the straws and watch a tape wave being created.
Experiment by hitting the wave machine at different places along its length or with different amounts of strength. Discuss how this changes the length or speed of the wave.