00:02
In this question, it is about hydrogen atom.
00:03
We want to find the potential energy, kinetic energy, and total energy for an electron in the ground state.
00:10
Okay, so to do this problem, we need the orbital radius of the ground state.
00:20
So we're using the ball radius formula, which is rn equals to 0 .0 529 n square nanometers for ground state.
00:39
And equals to 1, so r1 equals to 0 .0 529 nanometers.
00:47
So you can calculate the potential energy, which is negative e square over 4 pi, so not r1.
01:00
So the system is, you know, you have a proton and an electron, and so this is r1, the potential energy is just e square, for pi x or not are 1.
01:15
So putting the values, okay, and calculate this to be negative 4 .35 times 10 to the negative 18 juice.
01:43
So this is the potential energy.
01:48
Okay, the answer for part a, okay, next in part b, i want to find a kinetic energy.
01:54
Okay, so we know that the formula for kinetic energy is equal to half mv square, but we calculate this indirectly.
02:07
So we also know that in hydrogen atom or in boss model, okay, the electrostatic force is the centripetal force.
02:24
So e square over four pi, okay, electrostatic force is equal to centripetal force...