Being the planet closest to the sun, Mercury must be the one
with the shortest year. That's how gravity works.
longitude and latitude<span />
True, I just learned this a week ago. Is this for Chemistry?
Answer:
The observed wavelength on Earth from that hydrogen atom is
.
Explanation:
Given that,
The actual wavelength of the hydrogen atom, 
A hydrogen atom in a galaxy moving with a speed of, 
We need to find the observed wavelength on Earth from that hydrogen atom. The speed of galaxy is given by :

is the observed wavelength

So, the observed wavelength on Earth from that hydrogen atom is
. Hence, this is the required solution.
A. is the right answer since work is negative and Q which is heat in negative also