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Question

Which is responsible for the most helium found on Earth ?

A
Gamma decay
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B
Nuclear fusion
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C
Alpha decay
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D
Positron emission
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E
Nuclear fission
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Solution

The correct option is C Alpha decay
Alpha decay is responsible for most helium found on Earth.
Alpha decay of heavy atoms such as uranium and thorium present in the earth's crust gives helium nuclei.

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