Hi.
It's Mr. Andersen and this AP Physics essential video 4.
It is on the atom.
In the last video we talked about how Ernest Rutherford and his gold foil experiment had helped scientists discover this positive small nucleus in the center of an atom.
But that did not tell us what the electrons were doing.
And he just speculated that they were moving around the nucleus almost like planets in orbit around the sun.
But one of the researchers working underneath Rutherford, Niels Bohr spotted a problem in this.
He knew that any charged particle that is moving is going to be giving off electromagnetic radiation.
As it does that it is losing some of that energy.
And so it is quickly going to spiral into the middle and annihilate essentially the whole atom.
