## Free Particle Exercise #2

#### Please answer the following 3 questions
regarding the Physlet:

#### Description

The animation shows the time development of a free particle (Gaussian
wave packet). The graph shows the real (red) and imaginary (green) parts of the wave
function, the real (red) and imaginary (green) contributions to the probability density and
the total probability density. At x = 10 and x = -10 the particle experiences
the hard walls of the simulation, otherwise it is free.

#### Questions

Watch each animation for 2 time units before answering the
following questions.

- At t = 0 and t = 1 what is the probability of finding the particle between
x = -10 and x = 10?
- How does the maximum amplitude and width of the wave packet change with
time?
- Explain your answer to question 2. Try to be as complete as possible.

#### Credits

Script by Mario Belloni and Wolfgang Christian.

Questions by Mario Belloni.

Java applets by Wolfgang Christian.