What Is the Source of Energy That Allowed Supernova 1987A

question 71

Multiple Choice

What is the source of energy that allowed supernova 1987A to continue to brighten slowly for a few months after its initial explosion?

• A) Radioactive decay of specific nuclei produced in the explosion
• B) Thermonuclear reactions between iron nuclei and protons,neutrons,and helium nuclei
• C) Thermonuclear reactions between hydrogen nuclei in the shell of gas surrounding the supernova,triggered by the shock wave from the explosion
• D) Slow gravitational compression of the remnant core of the supernova and the consequent release of gravitational potential energy

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Definitions:

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A moral duty to act in accordance with ethical principles and standards.

Quantitative Data

Numerical information that can be measured and analyzed statistically to identify patterns, trends, or relationships.

Observer as Participant

An approach in qualitative research where the researcher both observes the study subjects and participates in the study setting while maintaining a professional distance.