Speed is the distance traveled
time
but velocity is the change in distance
time
I think D. It starts at (0.0) and goes to the correct points so it makes sense
It is 29 and a half days long
The photon can be absorbed and the energy of the photon is exactly equal to the energy-level difference between the ground state and the level d.
Helium has an atomic mass of 4.00 atomic mass units.
