Particles: a Neutral η⁰ (Having Mass 0

question 2

Multiple Choice

Particles: A neutral η⁰ (having mass 0.642 u) that is at rest decays into two gamma ray photons. What is the energy in MeV of each photon? (1 u = 931.5 MeV/c²)

• A) 299 MeV
• B) 597 MeV
• C) 1190 MeV
• D) 199 MeV
• E) 149 MeV

---

Definitions:

Mentally Charting

The cognitive process of mapping out or organizing thoughts, plans, or data in a structured manner.

Fast-Mapping

The process by which children are able to learn the meaning of a new word quickly and efficiently, often after a single exposure.

Lexical Addition

The process by which new words or phrases are introduced and incorporated into a language.

Categorical Embellishment

The addition of detailed or decorative elements to make a category or classification more distinct or appealing.