A wave traveling on a Slinky® that is stretched to a total length of 2.9 m takes 2.6 s to travel the length of the Slinky and back again.   What is the propagation speed of the wave, in meters per second?    A periodic standing wave is created in the same Slinky stretched to the same length. It contains three antinodes and four nodes. What is the frequency of the wave, in hertz?

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