What Is the Bias Voltage Across a Tunnel Gap?

[rwooduk]

Homework Statement

Homework Equations

See below.

The Attempt at a Solution

This is only a 1 mark question so I'm probably missing something really simple but I just can't figure it. Below is the slide we have been given:

Does anyone have any ideas?

 

[rwooduk]

It should be ~1V so the square potential is not deformed and the probability increase due to curved edges of the potential.

Not that it matters, the exam had nothing on this question or anything else I studied.