A free particle of mass m with Energy E and wave number k1 is traveling to the right. At x = 0, the potential jumps from zero to Vo and remains at this value for positive x.
Questions :
a) Obtain an expression for the reflection coefficient R and transmission coefficient for the case when E > Vo .
b) What will happen to the particle in the case when E < Vo .
Name:
Cyanide and Happiness2013-04-30 13:54
"I HEARD LAUREN BROKE UP WITH YOU. SORRY TO HEAR THAT, BUDDY."
"SOME GIRLS JUST CAN'T HANDLE A GUY WITH SOME INTELLIGENCE."
Earlier...
"TECHNICALLY IT'S THE PHOTONS BOUNCING OFF OF YOU THAT MAKE YOU LOOK FAT."
Richard Feynman was the originator of the idea of particles existing inside other particles
It is a cornerstone of the standard model of physics that entities such as protons are not point-like particles, but contain other entities known as quarks. The standard model is the theory concerning the electromagnetic, the weak and the strong nuclear interactions. Quarks interact with one another by exchanging gluons, equivalent to the way charged particles interact by exchanging photons. But it is not always appreciated that this whole package of ideas about particles within particles was developed by Feynman in the 1960s, at a time when the existence of quarks was regarded as a wild idea.
Feynman used the term 'partons' to include what are now knowns as quarks and gluons, and he was instrumental in encouraging the experiments that proved the existence of quarks. American physicist Murray Gell-Mann, Feynman's sometimes bitter rival and the man credited with the idea of quarks, used to sneer at what he referred to as Feynman's 'put-ons'. Like Feynman's diagrams, this made particle physics accessible even to people without the brain power of a Feynman or a Gell-Mann.
But Feynman had the last word. His ideas were picked up by experimenters at the Stanford Linear Accelerator Center (SLAC), a new particle accelerator built near the university's main campus. In August 1968, Feynman visited SLAC and looked over its data. He quickly realised that the results matched the predictions of his parton theory and his ideas spread through the team like wildfire.
Further experiments inspired by this proved the existence of quarks and also of the other kinds of partons predicted by Feynman. The experimenters - Jerome Friedman, Henry Kendall and Richard Taylor - received the Nobel Prize in 1990, two years after Feynman died.
FACT
Fascinated by picking locks, while working on the atomic bomb project at Los Alamos in the 1940s he would open the locked filing cabinets, simply to prove that documents within weren't secure.