Quantum Mechanics 1 Guaranteed A+
Review of Properties of a Free Particle (3)
1. Energy is not quantized! 2. They cannot have definite energy! 3. It is always described by a wave
packet! 4. wave packet always spreads with time! (just like in classical physics)
wave packet
a group of super...
1. Energy is not quantized! 2. They cannot have definite energy! 3. It is always described by a wave
packet! 4. wave packet always spreads with time! (just like in classical physics)
wave packet
a group of superposed waves that together form a traveling localized disturbance, especially one
described by Schrödinger's equation and regarded as representing a particle
annihilation operator
'lowing operator';
something operator
'raising operator';
"the wave packet always spreads with time"--why?
you have a superposition of different momenta, different momenta move with different speeds, and
this gives a distortion of the wave packet as it moves with time
variance, standard deviation related to expectation value (mean)
...and standard deviation is the square root of the variance
momentum operator
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