DOUBLE POINTS A musical pipe is closed at both ends. Resonance is created. What would happen if one end were opened?

The pitch would increase.
The pitch would stay the same.
The pitch would decrease.
The pitch would increase slowly over time.

Which of the following changes will increase the capacitance of a parallel-plate capacitor? (there could be more than one correct choice.) a) increase the charge on the plates b) decrease the poten5al between the plates c) increase the potential between the plates d) introduce a dielectric material between the plates e) decrease the separation between the plates