What Physical Mechanism Is Responsible for the Oscillations in Brightness

question 72

Multiple Choice

What physical mechanism is responsible for the oscillations in brightness that a Cepheid variable star undergoes?

• A) the fusion rate in the star's core varies periodically, changing the energy generation rate
• B) the amount of ionized helium in the star's outer layers vary, changing the opacity
• C) the fusion rate in the shell burning hydrogen varies, changing the energy generation rate
• D) the star's outer layers cycle between convection and radiative transport, changing the temperature

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Definitions:

Intergroup Bias

The tendency to favor one's own group over other groups, often resulting in prejudice and discrimination.

Interdependence

A condition where entities are reliant on each other, indicating a mutual dependency that influences outcomes and actions.

Group Favouritism

The tendency of individuals to give preferential treatment and favor members of their own group over those of other groups.

Group Identification

The extent to which individuals perceive themselves as being part of a group and align their attitudes and behaviors with group norms.