Question

An alpha particle (α), which is the same as a helium-4 nucleus, is momentarily at rest...

An alpha particle (α), which is the same as a helium-4 nucleus, is momentarily at rest in a region of space occupied by an electric field. The particle then begins to move. Find the speed of the alpha particle after it has moved through a potential difference of −3.45×10−3 V .The charge and the mass of an alpha particle are qα = 3.20×10−19 C and mα = 6.68×10−27 kg , respectively.

Part A

Mechanical energy is conserved in the presence of which of the following types of forces?

Select all that apply.

A- electrostatic
B- frictional
C- magnetic

D- gravitational

Part B- Which of the following quantities are unknown?

A- the initial speed of the alpha particle
B- the value of the electric potential at the initial position of the alpha particle
C- the value of the electric potential at the final position of the alpha particle
D- the final speed of the alpha particle
E- the charge of the alpha particle
F- the difference in potential between the initial and final positions of the alpha particle

G- the mass of the alpha particle

Solve

Part C- Use conservation of energy (Ki+qVi=Kf+qVf) to solve for the final kinetic energy. Then use this value to solve for the final velocity of the alpha particle.
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