Light illuminating a pair of slits contains two wavelengths, 550 nm and an unknown wavelength. The 10th bright fringe of the unknown wavelength overlaps the 9th bright fringe of the 550 nm light. what is the unknown wavelength?

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show the wavelengths of a wave. show the crests of a wave.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.