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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