Question:

If an object is moving toward you, what effect do you observe in the spectrum of that object?

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a. It appears red-shifted.

b. The light appears to be moving faster.

c. All the spectral lines appear broadened. d. It appears blue-shifted.

e. The light appears brighter.

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3 ANSWERS


  1. You've been posting your homework in the physics section all summer.  I'd be curious to find out your final exam grade after never doing a problem on your own.

    Since I'm sure it won't make a difference to your grade at this point, the answer is 'd'.


  2. Blue Shift

    But it would need to be moving fast.

  3. We know that other galaxies are moving away from us because of the red-shift in the spectrum. If something is moving towards us, there must be a blue-shift. So the answer would be d.

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