What Characteristic of Cepheid Variables Makes Them Extremely Useful to Astronomers

question 124

Multiple Choice

What characteristic of Cepheid variables makes them extremely useful to astronomers?

• A) The absolute magnitude of Cepheid variables is related directly to their period of pulsation.
• B) The absolute magnitude of Cepheid variables is directly related to their diameter.
• C) The absolute magnitude of Cepheid variables is related directly to their metal content (heavy element abundance).
• D) The absolute magnitude of Cepheid variables is related directly to their surface temperature.

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Definitions:

Negative Punishment

A behavior modification technique where a desirable stimulus is removed following an unwanted behavior, with the aim of decreasing that behavior in the future.

Stimulus Generalization

A psychological phenomenon in which a response to a specific stimulus becomes associated with similar stimuli, leading to the same response to the similar stimuli.

Secondary Reinforcer

A stimulus that has become reinforcing through its association with a primary reinforcer, often used in behavioral training and conditioning.

Primary Reinforcer

A stimulus that satisfies a basic biological need, such as food or water, and is inherently rewarding.