A source of frequency "r' sends waves of wavelength "X" traveling with speed "v" in some medium. If the frequency is changed from f to "2f", then the new wavelength and new speed are (respectively):

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A source of frequency "r' sends waves of wavelength "X" traveling with speed "v" in some medium. If the frequency is changed from f to "2f", then the new wavelength and new speed are (respectively):