Sound waves and waves in a stretched spring are longitudinal waves. P waves are also longitudinal waves. Longitudinal waves show areas of compression and rarefaction. In the slideshow below, the areas of compression are where the parts of the spring are close together, while the areas of rarefaction are where they are far apart.
An outstretched slinky spring. Ten coils near one end are compressed. In this type of wave - a longitudinal wave - the particles of the medium vibrate in a direction parallel to the direction of energy transport. For more information on physical descriptions of waves, visit The Physics Classroom Tutorial.
Detailed information is available there on the following topics:. Physics Tutorial. My Cart Subscription Selection. The oceans around New Zealand are promising places to generate wave power because we have large waves and strong currents. Generating wave power would involve an underwater device like a paddle, for example that would move in response to waves and drive a turbine that would produce electricity. However, they are quite inefficient — they need a lot of coastal space to generate useful quantities of energy.
After a review none of the projects were selected to progress further and, as of , EECA believe that the abundance of cheaper renewable energy resources in New Zealand makes it unlikely marine energy will contribute to the national grid in the foreseeable future. Investigations into harnessing the energy of ocean waves continues in other countries. From to , as part of a Sustainable Seas Innovation Fund project, NIWA investigated whether generating electricity from the strong tidal currents within the Cook Strait would be viable for Aotearoa.
To find out more, see Energy from tidal currents — Kick-starting a new marine industry with huge potential from NIWA's website. Use a Mexican wave to demonstrate how waves transfer energy and to help your students visualise the wave behaviours of reflection, constructive interference and shoaling. Use an interactive or paper-based Venn diagram to illustrate the key similarities and differences between tsunami waves and surf waves.
Explore more about waves, such as sound and energy by browsing the resources under our waves concept. In NIWA ran a webinar: A step closer to a future powered by tidal current energy , in which the results of the Energy from tidal currents project are presented. This project investigated the viability of generation electricity from the strong tidal currents within Cook Strait.
Find out more about using waves as an energy source in this Wikipedia article. Add to collection.
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