Tritium Is an Isotope of Hydrogen That Has Two Neutrons $\beta$

question 5

Multiple Choice

Tritium is an isotope of hydrogen that has two neutrons in addition to its proton. Tritium undergoes $\beta$ ^- decay with a half-life of 12.3 years. What percentage of an initially pure sample of tritium will remain undecayed after 35 years?

• A)2.9 %
• B)6.0 %
• C)7.0 %
• D)14 %
• E)19 %

Apply knowledge of intelligence theories to select appropriate assessment tools.

Acknowledge the complexity and ethical considerations in the assessment of intelligence.

Understand Robert Sternberg's theory of intelligence, including the three fundamental forms (analytic, practical, creative) and their applications.

Distinguish between fluid and crystallized intelligence, their characteristics, and their change over the lifespan.

---

Definitions:

Photoreceptor

Sensory receptor that is sensitive to light—for example, rods and cones of the retina.

Lens Flattens

A process where the lens of the eye changes shape, becoming less curved, to focus distant objects clearly onto the retina.

Ciliary Muscles

Ring-shaped muscles located in the eye that control the shape of the lens to focus on objects at varying distances.

Pupil Diameter

The size of the opening in the center of the iris of the eye, which varies to regulate the amount of light reaching the retina.