# Potential step problem

1. Jan 10, 2017

### tarkin

1. The problem statement, all variables and given/known data
Please see attached image. I'm trying to do part (d), then (e) afterwards.

For (d) I can sketch the graph okay, just trying to calculate T now.

2. Relevant equations
T= 4k1k2/(k1+k2)2

k = ((2m/ћ)2(E-V))½

3. The attempt at a solution

I tried substituting in k into the equation for T. But k depends on the mass of the particle, which isn't given in the question. So what can I do here? I guess one option is just finding the point on the graph, but that's not really a calculation.

#### Attached Files:

• ###### potentialstep.jpg
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2. Jan 10, 2017

### Staff: Mentor

Look carefully at the equation for T after having substituted the equation for k.

3. Jan 10, 2017

### tarkin

When I subbed in k I hoped the m's would cancel but I couldn't get them to. Is it just some mistake I'm making - should they indeed cancel?

Thanks

4. Jan 10, 2017

### Staff: Mentor

It should. You have k's squared both at the numerator and the denominator.

5. Jan 10, 2017

### tarkin

Okay, I'll take another look at my working out. Thanks a million!