A Slinky can show two different types of waves - longitudinal and transverse.

Read more: The Difference Between Transverse & Longitudinal Waves

Nodes and anti-nodes can be seen in a Slinky

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Read more: Standing Waves on a Spring

A strobe light can make a vibrating string appear bent and unmoving in midair! 

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Read more: Standing Waves and the Strobe Effect

The wave machine is used to show how the frequency and the wavelength of a wave depend on one another. 

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Read more: Wavelength & Frequency