# Potential step problem

## Homework Statement

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.

## Homework Equations

T= 4k1k2/(k1+k2)2

k = ((2m/ћ)2(E-V))½

## 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.

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

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

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

It should. You have k's squared both at the numerator and the denominator.
Okay, I'll take another look at my working out. Thanks a million!