Aprocessing speed of gigahertz (ghz) represents two billion cycles per second.

The word giga is a prefix in the metric system which stands for a factor of billion while the hertz is a unit which is also equivalent to cycle / s (cycle per second).

Therefore the answer to this is:

2 gigahertz = 2 billion cycles per second

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.