A Proton Is Projected at a Stationary ${ } _ { 88 } ^ { 226 }$

question 72

Multiple Choice

A proton is projected at a stationary ${ } _ { 88 } ^ { 226 }$ Ra aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the nuclear force on the proton is negligible. The initial kinetic energy of the proton, in $\mathrm { MeV }$ , is closest to:

• A) \(5.8 \mathrm { MeV }\)
• B) \(2.9 \mathrm { MeV }\)
• C) \(8.7 \mathrm { MeV }\)
• D) \(13 \mathrm { MeV }\)
• E) \(17 \mathrm { MeV }\)

---

Definitions:

Psychopathology

The scientific study of mental disorders, including their symptoms, causes, treatments, and effects on individuals’ lives.

Anxious Adults

Individuals who experience chronic anxiety and stress in their daily lives, which can impact their social interactions, work, and personal well-being.

Rational Human Beings

Individuals who are capable of thinking logically and making decisions based on reason rather than emotions.

Conscious Perception

Conscious perception is the awareness of one's environment and internal states and processes, including thoughts and feelings, in the present moment.