Question

which sentence is an example of how a scientist might use a model?
○ a wrench is used to tighten a nut onto a piece of wood.
○ marbles placed inside a hollow sphere are used to describe protons in a nucleus.
○ microscopes are used to magnify a group of cells on sets of slides.
○ stopwatches measure the amount of time it takes for runners to complete a mile.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: A wrench tightening a nut is a tool use, not a scientific model.
• Option B: Marbles in a hollow sphere represent protons in a nucleus, which is a scientific model (using a physical representation to explain an atomic structure).
• Option C: A microscope magnifying cells is a tool for observation, not a model.
• Option D: A stopwatch measuring time is a tool for measurement, not a model.

Answer:

B. Marbles placed inside a hollow sphere are used to describe protons in a nucleus.