Explain newton's third law of motion

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .

How to calculate voltage drop in a series circuit