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    Question

    The source of the sun's energy is the process of

    –
    A Photoelectric emission Correct Answer Incorrect Answer
    B Nuclear fission Correct Answer Incorrect Answer
    C Nuclear fusion Correct Answer Incorrect Answer
    D Thermionic emission Correct Answer Incorrect Answer

    Solution

    The Sun formed about 4.6 billion years ago from the gravitational collapse of a region within a large molecular cloud. Most of the matter gathered in the center, while the rest flattened into an orbiting disk that would become the Solar System. The central mass became increasingly hot and dense, eventually initiating thermonuclear fusion in its core. It is thought that almost all other stars form by this process.

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