The top spectrum shows part of the Sun's spectrum. State and explain which letter best represents the light from a star that is similar to the Sun.
The Attempt at a Solution
I originally was thinking A but my book says B but only gives numerical answers and no explanation. Even though it mentions nothing about red shift in the question I am thinking it must be implying that this star is showing red shift? All the lines in A have shifted by the same amount and therefore I thought they would be giving off light the same as the Sun. The only guess at why B might be correct was that I was thinking that bigger wavelengths will shift more than shorter wavelengths (this is a logical guess that may be wrong). I thought about it like this. If I give the first line for the Sun a number like 1, then second line 2 and the last line 8. If the space between the Sun and this star doubled for example whilst the light was travelling to us then the wavelength of the first line will be twice as big, the second line 4 times and the last line 16 times. Again, I have no idea if this actually happens as all diagram on google images do not show an increase in the distance between adjacent spectral lines. I am just trying to come up with an idea to fit the answer.
Thanks for any help given.