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.

Infrared radiation emitted by the object is shifted towards red light.

Ultraviolet radiation emitted by the object is shifted towards blue light.

Green light emitted by the object is shifted towards red light.

Explanation / Answer

Here ,

for stars

when a star moves away from us , we will see red shift

and when a star moves towards us , we will see blue shift

Now, for the given scenrios

Radio waves emitted by the object is shifted towards infrared light.
>> as the wavelength is decreasing , Object is moving closer

Infrared radiation emitted by the object is shifted towards red light.
>> as the wavelength is decreasing , Object is moving closer

Ultraviolet radiation emitted by the object is shifted towards blue light.
>> as the wavelenth is increasing ,the object must be moving away

Green light emitted by the object is shifted towards red light.
>> as the wavelenth is increasing ,the object must be moving away

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