Question

Hi All

can somebody help me in conducting this experiment. It is on phet computer simulation software. It would be really appreciable.

kind regards

Experiment A Use the PhET computer simulation "Quantum Tunneling and Wave Packets"to investigate the behaviour of the transmitted and reflected components of an electron incident on a step potential. The incident electron will be described by a complex plane wave. Potential step Set the parameters of the simulation as shown at right. Stop the time evolution (the pause" button at the bottom of the window) and reset the time to zero. Show energy values Show reflection and transmission probabilities Begin by investigating the situation when the total energy of Electron Wave Function view the electron is larger than the potential on both side of the step. Vary the total energy ie, the green line on the top chart),maginary part_ keeping it above the potential, and describe what happens to the wavefunction. Compare the effect of the energy variation on ther wavefunction on the two sides (i.e. for0) Vreal part_ magnitude □ phase 011112m Direction of incoming wave Pay close attention as the total energy nearly matches the energy of the potential forx>0 Electron Wave Function form With a fixed total energy that is higher than the potential for wave all x, vary the height of the potential step and describe the effect on the wavefunction. How is this similar, and how does O plane wave Incoming/Reflected waves it differ, to the variation of total energy perfomed in the previous investigation O sum O separate Repeat the above investigations with the "Incoming/Reflected wave" setting on separate". Describe how the incoming and reflected wavefunctions respond differently to the variations, and explain why this makes physical sense Exercise A2: Check the "Show energy values" box, and use the values shown to calculate the transmission and reflection co-efficients (you may want to refer to your lecture notes or the reference section at the end of these lab notes). Compare your calculated values to the values given in the simulation by using the "Show reflection and transmission probabilities" option. Now repeat all of the above experimental investigations with the total enèrgy lower than the potential for> 0. Also describe what happens to the wave function as the total energy is varied from just above to just below the potential step value. Part B: Incident Plane Wave -II Now conduct a similar investigation as in Part A, but change the potential to a rectangular barrier (use the drop-down menu at the top of the parameter list, and select "barrier/well")

Answer 1

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