When studying the behaviour of waves, one of the challenges that students faces is that they cannot see the thing that is causing the wave to happen whether it is oscillating air particles or an electromagnetic field. Having visualisations and simulations can really help students ‘see’ what is happening and get a sense that the wave moves energy from one place to another but the thing it travels through does not move with the wave (or even need to be there at all). The first few links provide some suggestions to help in this regard and the jelly baby wave machine is very much worth the effort!
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