Question

If a proton is moving from a region of higher potential to a region of lower potential, what is its change in speed?

	A.	The speed stays the same.
	B.	The speed decreases.
	C.	Unable to be determined.
	D.	The speed increases.

If a neutron is moving from a region of higher potential to a region of lower potential, what is its change in speed?

	A.	The speed increases.
	B.	The speed decreases.
	C.	Unable to be determined.
	D.	The speed stays the same.

If an electron is moving from a region of higher potential to a region of lower potential, what is its change in speed?

	A.	The speed decreases.
	B.	The speed increases.
	C.	The speed stays the same.
	D.	Unable to be determined.

Answer 1

1. When proton goes higher potential to lower potential, it's electrostatic potential energy(qv) decrease so using energy conservation, it's kinetic energy increases, hence it's speed increases.(D)

2.proton doesn't get affected from electric field or electric potential because it has zero charge so kinetic energy doesn't change, hence speed remains the same.

3. When electron goes higher potential to lower potential, it's electrostatic potential energy (qv) increases because charge is negative so using energy conservation, it's kinetic energy decreass, hence it's speed decreases.