**Quantum Mechanical Wave Packets - revised questions:**

*Please substitute these questions for the ones posted on the lab webpage
in Section 2b:*

- For the default superposition f(x,t)+g(x,t), measure the wavelength and frequency of the wave inside the envelope and the envelope itself. Compare your measured results with those predicted by the beat pattern formula.
- Calculate the group and phase velocities for the default sum wave. Now click the forward button and describe the motion of the wave.
- Change g(x,t) to 2*cos(2.6*pi*x-2.2*pi*t). (Be sure to click the
*Change*button!) Calculate the group and phase velocities for the new sum wave. Click the forward button and describe the motion of the wave. - Change g(x,t) to 2*cos(2.6*pi*x-2.0*pi*t). Calculate the group and phase velocities for the new sum wave. Click the forward button and describe the motion of the wave.