Thus hot regions of the Sun, whose atoms move faster and therefore have more energy, are likely to emit shorter wavelengths. That light is also emitted in photons. The discovery of electromagnetic waves. The lesson may be started with a discussion of waves. It isn't completely accurate, but it covers the waves studied here.
Ripples forming on the surface of water, after a stone is thrown in.
Sound waves, in air, water and solid materials. Earthquakes propagate as waves in the solid earth. These can be viewed as one-dimensional waves, spreading along a given direction only. Radio Waves . So are electrons and ions.