Slinkys
remeber when slinkies used to be the best thng and they would be somuch fn until they got tangled up then it would be a nightmare. However when i was young i didnt knowthat when i was playing with myslinky i was producing what waves look like because if you shake a slinky then it will move down the slinky with a fixed speed and a height based one how quicjly you move the slinky back and forth and this is becuase the waves speed is fixed because amplitude and wavelength and inversly proportinate to eachother not only that but if it has enough energy and someone is holeding the other side then it will reflect off of the other side and then the wave will start coming back towards you and continue to transfer energy until it dies out.
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