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Suppose a wave of wavelength λ travels in some medium. (a) If the period of the wave is T, how far does the wave travel in a time 10T? (Give your answer in units of λ.) (b) If the wave enters a different medium, where the wave speed is twice what it was before, what is the new wavelength? Note that the frequency of the wave will be the same in the new medium. (Give your answer in units of λ.) 

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