On the Ritcher scale,from magnitude 5 to magnitude 9,how much is the difference in "Amplitude" and what is the difference in energy?

Had to Google this one, Mozart; great question!

"Since the energy of an earthquake is proportional to the square root of the cube of the amplitude, each step of the Richter scale has an energy 103/2 (~ 31.6) times that of the previous step. So while a magnitude 9 has 10,000 times the amplitude of a magnitude 5 earthquake, it has a million times more energy."

Earthquakes

Good answer SR, but while clicking on your source, somehow it didn't work.

Let's try this one:http://www.answers.com/topic/richter-magnitude-scale

Don't know how that happened, but you are correct! Let's try it again

Earthquakes