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Wavelength
Radio waves, television waves and microwaves have different wavelengths. Image Credit: NASA
the distance between one peak or crest of a wave of light, heat, or other energy and the next peak or crestSentences:
NASA's satellites study different wavelengths of light from space.
Wavelengths can look like waves in the ocean; and just like in the ocean, some are small and others are huge.
More Information:
http://www.nasa.gov/audience/forstudents/k-4/dictionary/Electromagnetic_Spectrum.html
http://science.hq.nasa.gov/kids/imagers/ems/ems.html →
http://science.hq.nasa.gov/kids/imagers/ems/waves3.html →