You are Here: Home >< Physics

# The Potential Step - Quantum Mechanics (Additional steps in between needed)? Watch

1. So, I only got 5/7 for this question and I'm not sure where and what the additional steps in between this solution is needed.*Attachment 585736585740*Attachment 585736585740585700
Attached Images

2. (Original post by Airess3)
So, I only got 5/7 for this question and I'm not sure where and what the additional steps in between this solution is needed.*Attachment 585736585740*Attachment 585736585740585700
I guess that it is because you did not show the working of how you combine the two continuity equations meaning solving the two simultaneous equations to obtain T and R respectively.
It may also be good that make all your workings explicit in future unless you are told by your lecturer otherwise.
Hope it helps.
3. (Original post by Eimmanuel)
I guess that it is because you did not show the working of how you combine the two continuity equations meaning solving the two simultaneous equations to obtain T and R respectively.
It may also be good that make all your workings explicit in future unless you are told by your lecturer otherwise.
Hope it helps.
Thanks. Could also explain the (matching psi) and *(matching derivative of psi) part of my answer? I copied that from the board and when I looked back on it, I didn't quite understand how it related to the question.
4. (Original post by Airess3)
Thanks. Could also explain the (matching psi) and *(matching derivative of psi) part of my answer? I copied that from the board and when I looked back on it, I didn't quite understand how it related to the question.
I don't quite understand your question.

Hope the following would help:

Matching the wavefunction at x = 0:

wavefunction in A = wavefunction in B

Matching the derivative of wavefunction at x = 0:

derivative of wavefunction in A = derivative of wavefunction in B

=

Imposing these conditions allow us to have a smooth wavefunction.
5. (Original post by Eimmanuel)
I don't quite understand your question.

Hope the following would help:

Matching the wavefunction at x = 0:

wavefunction in A = wavefunction in B

Matching the derivative of wavefunction at x = 0:

derivative of wavefunction in A = derivative of wavefunction in B

=

Imposing these conditions allow us to have a smooth wavefunction.
Thanks.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 13, 2016
Today on TSR

### How to stand out in an Oxbridge interview

What makes you memorable?

### A pregnant woman visits me every night

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE