Stars and other galactic objects may be moving towards or away from us at very h

Question

Stars and other galactic objects may be moving towards or away from us at very high speeds. This leads to a doppler shift of the electromagnetic radiation observed from this object. In each of the following cases, you are given the type of emitted radiation (as if you were at rest relative to the object) and the type of radiation towards which the observed light is shifted. From this information determine whether the object is traveling towards or away from you. Radio waves emitted by the object is shifted towards infrared light. Red light emitted by the object is shifted towards infrared radiation. Green light emitted by the object is shifted towards red light. Ultraviolet radiation emitted by the object is shifted towards blue light. Submit Answer Tries 0/10

Explanation / Answer

If the wavelength decreases then the object is traveling towards you and if the wavelength increases, the object is traveling away from you.

Radio waves have a longer wavelength compared to infrared and since they are getting shifted to a short infrared wavelength, the object is traveling towards you.

Red light shifting towards infrared means an increase in wavelength and thus the object is going away from you.

Green to red shows increase in wavelength and thus the object is going away from you.

UV to Blue shows increase in wavelength and so the object is going away from you.

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