Sodium-21 Will Emit Positrons, Each Having an Energy of 4

question 5

Multiple Choice

Sodium-21 will emit positrons, each having an energy of 4.0 × 10^-13 J. What is this energy in MeV? (1 MeV = 1.602 × 10^-13 J)

• A) 4.0 × 10^-7 MeV
• B) 2.5 MeV
• C) 40 MeV
• D) 2.5 × 10⁶ MeV
• E) 2.5 × 10^-6 MeV

---

Definitions:

Stigma Consciousness

The heightened sensitivity to situations where one may be subject to stereotype or discrimination due to an attribute, leading to potential adjustments in behavior or self-perception.

Stereotype Threat

The anxiety or fear that one's behavior or performance might confirm a negative stereotype about one's group, potentially undermining performance.

GPA

Grade Point Average, a numerical measure that represents the average value of the accumulated final grades earned in courses over time.

Correlational Approach

A research strategy that involves observing and measuring the relationship between two or more variables without manipulating them.