# Homework Help: Probability of quantum tunneling of tennis ball knowing mass, velocity, wall width

1. May 23, 2010

### Mr_Cloud

1. The problem statement, all variables and given/known data

Suppose that a ball is tossed at a wall; what is
the probability that it will tunnel through to
the other side? The mass of the ball is 0.14 kg,
the width of the wall is a = 0.2 m, and the one
who tossed the ball was deadly tired, so that
the ball is tossed only weakly at 1.0 m/s.

a=0.2m
m=0.14kg
v=1m/s

2. Relevant equations

$$T=[1+\frac{V_{0}^{2}}{4E(V_{0}-E)}sinh^{2}(\frac{2a}{\hbar}\sqrt{2m(V_{0}-E)}]^{-1}$$

3. The attempt at a solution

I presume I must use that equation, though I have no idea what the value of V0 or (V0-E) is! How do I do this?