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Nova are thought to occur in a system, X, in which a white-dwarf star orbits a red giant star. What is X?

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Nova are thought to occur in a system, X, in which a white-dwarf star orbits a red giant star. What is X?

(a) Triple System

(b) Binary system

(c) Compact system

(d) Congenial system

The question was asked in an interview for internship.

Question is from Cosmology in portion Quantum Physics of Engineering Physics I

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The correct answer is (b) Binary system

The explanation is: A binary system is the one where two stars orbit around a common center of mass. When a white-dwarf star orbits a red-giant star, novae are formed.

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