Topic 1 The Bohr Model
(a) What is the Bohr model of the atom?
(b) Why didn't Bohr like it?
Topic 2 Lasers
How do lasers work?
Examples
The diameter of a Bohr atom is about an Angstrom
unit, which is 10-10 m. What is this in nanometers and picometers?
[ 1 Å = 10-110-9 m = 10210-2 m]
The radius of the first Bohr orbit is 52.9 pm (10-12 m) as found by setting
m = 9.11 x 10-31 kg for an electron and Z = 1 for hydrogen in
What would be the electric field at the surface of
a metal sphere this size if one could be found made of particles fine
enough to make such a thing? [ 27 V ]
What would be the voltage at the surface of
such a sphere? [ 514 GV/m ]
What would be the size of the first Bohr orbit for Helium with twice the charge? In the Bohr picture of 1911, what would be bigger, a hydrogen molecule or a helium molecule?
Textbook Problems
|
Level |
Do to hand in |
Read and do for yourself |
| A | 3, 5 | 1 |
| B | 7, 9, 11 | 5, 6 |
| C | 1 | 2, 5 |