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Unformatted text preview: eye every second! The frequency of violet light is even higher—over 750 trillion Hz. Other types of electromagnetic radiation, like X­rays, have even higher frequencies, and some have lower frequencies, like radio waves. Just as our ears are only capable of hearing certain range of sounds (20 – 20,000 Hz), our eyes can only see a small range of frequencies. Frequency and Wavelength (cont.) Because visible light waves have such high frequencies, their wave­ lengths are very short. Recall the formula v = λf (wave speed = wavelength × frequency). Since light of any frequency always travels at the same speed in a vacuum, v is a constant. Thus, the bigger f is, the smaller λ must be. Red light, for example, has a wavelength of only about 700 nm. (1 nm = 1 nanometer = 10­9 m = 1 billionth of a meter.) Violet light has an even smaller wavelength, since its frequency is higher. X­rays have still smaller wavelengths. Radio waves can have very long wavelengths (many meters) since their frequencies are so low. High...
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