conduction - the transfer of heat through a substance, conductor - a substance that allows the transfer of heat, convection - the transfer of heat by movement of a liquid or gas, insulator - a substance that resists the transfer of heat, Amplitude - half the height of the wave, Frequency - the number of waves passing a point every second, Longitudinal - running lengthwise rather than across, Transverse - running across rather than lengthwise, Vacuum - empty space, Wavelength - the distance from the peak of one wave to the next, reflect - send back sound or light without absorbing it, sonar - sound navigation and ranging, Electromagnetic spectrum - all the different electromagnetic waves, gamma ray - radiation emitted by radioactive materials, infrared light - an electromagnetic wave with longer wavelength than red light, X-ray - a high-energy ray that can penetrate materials, angle of incidence - the angle at which light hits a surface, angle of reflection - the angle at which light reflects from a surface, opaque - a material that doesn’t allow any light to pass through, refract - bend (light), translucent - a material that allows some light to pass through, transparent - a material that allows light to pass through,

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