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

Question

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.

Answer 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'.

Answer 2

Blue Shift

But it would need to be moving fast.

Answer 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.