Two atoms interacting with each other have the potential energy shown in the figure.  You may assume that the massive atomís mass is much larger than the light atomís mass, the light atom can only move along the x axis, and U(x) -> 0 smoothly as x -> infinity.

1. 0.03nm
2. 0.05nm
3. 0.2nm
4. other

If the system has total energy of +3 x 10^-21J and the little atom is at x=0.11nm at t=0 the atoms are

1. Bound
2. Unbound
3. It depends on the little atomís initial direction of motion
4. Depends on the atomís initial speed

1. x=0
2. x=0.04nm
3. x=0.11nm
4. x=0.2nm
5. x=0.3nm
6. other

Imagine that at t=0, the little atom is at position x=0.11nm and has a kinetic energy of 5 x 10^-21J.  About how much energy would we have to add to break the bond?

1. 1x10^-21J
2. 6x10^-21J
3. 12x10^-21J
4. none: the bond is already broken