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.

1. towards or away? Red light emitted by the object is shifted towards infrared radiation.
2. towards or away? Ultraviolet radiation emitted by the object is shifted towards red light.
3. towards or away? Green light emitted by the object is shifted towards blue light.
4.towards or away? Blue light emitted by the object is shifted towards ultraviolet radiation.

Explanation / Answer

Travelling away from you produces a red-shift (longer wavelength) and moving towards you produces a blue shift (shorter wavelength)

Wavelength increases .. (shortest) UVbluegreenredIR (longest)

Ans

1) away

2)away

3)towards

4)towards

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