Friday
March 24, 2017

Post a New Question

Posted by on Wednesday, November 9, 2011 at 10:52pm.

Suppose a beam of 5.0 eV protons strikes a potential energy barrier of height 5.5 eV and thickness 0.57 nm, at a rate equivalent to a current of 825 A.
(a) How long would you have to wait-on average-for one proton to be transmitted?

(b) How long would you have to wait if the beam consisted of electrons rather than protons?

  • physics - , Wednesday, November 9, 2011 at 11:43pm

    This is a quantum mechanical "barrier penetration" problem.

    See

    http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/barr.html

    or any of many other websites about this phenomenon. There you will find the formula you need.

    Convert the current to a particle arrival rate. Multiply that by the probability of penetration to get the penetration rate. The reciprocal of that is the time you would have to wait.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question