00:01
So considering an n equals 3 orbit and something that follows the debrolj wavelength hypothesis and has a radius r of 4 .77 times 10 to minus 10 meters for part a, we're asked to find the velocity.
00:13
Okay, so considering that angular momentum classically is just mass, where mass is the mass of an electron, times the velocity, times the radius of the orbit, and then also, according to the debrolgia hypothesis, is equal to n times h, divided by, 2 pi.
00:33
Rearranging this equation, we can solve for v.
00:37
We find that it's equal to n times h divided by 2 pi times the mass, times the radius of orbit.
00:46
Plugging these values into the equation, we find that this is equal to, uh, excuse me, 7 .3 times 10 to the 6th, make sure, or excuse me, times 10 to the 5th meters per second.
01:11
So now we've found the speed of the electron as it orbits at this orbital.
01:17
Part b would like us to find the wavelength according to the droplet j hypothesis.
01:23
So we plug lambda in here, or sulfur lambda here.
01:27
And lambda is equal to h divided by the mass, where again mass is the mass of an electron times the velocity v because it's equal to h divided by the momentum...