Rubidium-87 Decays by Beta Decay with a Half-Life of 4

question 57

Multiple Choice

Rubidium-87 decays by beta decay with a half-life of 4.9 * 10¹⁰ yr. How many ⁸⁷Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour

• A) 9.0 * 10¹⁶ atoms
• B) 4.3 * 10^-4 atoms
• C) 2.2 * 10¹⁸ atoms
• D) 2.5 * 10¹⁴ atoms
• E) 1.7 * 10¹⁴ atoms

Describe the mechanical processes involved in moving food through the gut, including peristalsis and muscle contractions.

Explain the role of hormones in regulating digestive functions and their impact on different gut segments.

Recognize the importance and mechanisms of acidic environment maintenance in the stomach and its effects on enzyme activity and microbial safety.

Understand the origin, role, and path of digestive enzymes and secretions involved in the breakdown and absorption of nutrients.

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Definitions:

LMX Theory

Leadership Member Exchange Theory, which suggests that leaders develop unique one-to-one relationships with each of the people reporting to them, affecting outcomes like job satisfaction and performance.

Exchange Relationship

Interaction between two parties involving the provision of goods, services, or sentiments in return for something of value.

LMX

Leadership-Member Exchange, a theory focusing on the dyadic relationships between leaders and followers, influencing many outcomes in the organizational context.

Social Exchange Theory

A theoretical framework suggesting that social behavior is the result of an exchange process aiming to maximize benefits and minimize costs.