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

question 68

Multiple Choice

Sodium-21 will emit positrons each having an energy of 4.0 *10¯¹³ J. What is this energy in MeV?

• A) 4.0 *10¯⁷ MeV
• B) 2.5 MeV
• C) 40 MeV
• D) 2.5 * 10⁶ MeV
• E) None of these choices is correct.

---

Definitions:

Unskilled Work Force

Workers with limited or no special training or education, often employed in tasks that require minimal technical skills.

Commercial Zone

An area designated for business purposes, often regulated by specific zoning laws to organize the distribution of businesses and services.

Transportation Rate

The cost associated with moving goods or people from one location to another, often determined by distance, mode of transport, and cargo type.

Grid Technique

A method used in planning and analysis that involves organizing data or information in a grid format for easy comparison and decision-making.