Arock found in a belt, originates between mars and jupiter what is it

Apossible explanation for a set of facts that can be tested by further investigation is called

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?