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Part AWe divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to right in order of increasingwavelength. To rank items as equivalent, overlap them.Hint 1. The wavelength of radio wavesAny light wave with a wavelength longer than 1 is considered a radio wave. This fact should help you place radio waves correctly inPart A.
CorrectNotice that these wavelengths span an enormous range. The wavelengths of gamma rays can be smaller than the size of an atomic nucleus, while thewavelengths of radio waves can be many meters (or even kilometers) long. Visible light spans only a very narrow range of wavelengths, from about400 at the blue (violet) end to about 700 at the red end.Part BRank the forms of light from left to right in order of increasing frequency. To rank items as equivalent, overlap them.Hint 1. What is the mathematical relationship between frequency and wavelength?HelpResetnanometersnanometers×the longer the wavelength, the higher the frequencythe longer the wavelength, the lower the frequencygamma raysX raysultravioletvisible lightinfraredradio wavesLongest wavelengthShortest wavelength
CorrectNotice that the frequency order is the opposite of the wavelength order from Part A. You can understand why if you recall that wavelength timesfrequency always equals the speed of light. Because the speed of light is a constant, longer wavelengths must mean lower frequencies, and viceversa.Part CRank the forms of light from left to right in order of increasing energy. To rank items as equivalent, overlap them.Hint 1. What is the mathematical relationship between frequency and energy?HelpReset×the higher the frequency, the higher the energyenergy depends on both frequency and the speed of lightthe higher the frequency, the lower the energyradio wavesinfraredvisible lightultravioletX raysgamma raysHighest frequencyLowest frequency
CorrectNotice that the energy order is the same as the frequency order from Part B, which means it is opposite the wavelength order from Part A. The reasonis that the energy of a photon of light is proportional to its frequency:energy = Planck's constant frequencyPart DRank the forms of light from left to right in order of increasing speed. To rank items as equivalent, overlap them.