How Many Radioactive Atoms Are Present in a Sample That

question 36

Multiple Choice

How many radioactive atoms are present in a sample that has an activity of 0.5 μCi and a half-life of 10 years? (1 curie = 3.7 × 10¹⁰ decays/s)

• A) 9.5 × 10¹² atoms
• B) 8.4 × 10¹² atoms
• C) 7.3 × 10¹² atoms
• D) 6.5 × 10¹² atoms
• E) 2.7 × 10⁵ atoms

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Definitions:

Gestalt Grouping

Refers to the psychological principles that allow humans to perceive objects as organized patterns and wholes, rather than mere collections of individual components.

Similarity

The state of being alike or having common features.

Color

The characteristic of visual perception described through categories such as hue, saturation, and brightness, derived from the wavelengths of light.

Peripheral Vision

Peripheral vision is the ability to see objects outside the direct line of vision, providing spatial awareness and the detection of motion.