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The wavelength of light coming from a particular star measures 4 cm. If the rest wavelength of that light is 12 cm, what can I

The wavelength of light coming from a particular star measures 4 cm. If the "rest wavelength" of that light is 12 cm, what can I conclude about the distance between my location and that star?

a. the distance is decreasing

b. the distance is increasing

c. Doppler shift gives speed information

d. the distance is unchanging

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