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In which of the following, weak nuclear forces appear?

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a

α decay

b

β decay

c

γ decay

d

Positron emission

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detailed solution

Correct option is B

Weak nuclear force is responsible for emission of β particles .

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A radio active nucleus emits both $α$ and $β^{-}$ particles. Initial mass number of the nucleus is 298. After emission of $α$ and $β^{-}$ particles, the nucleus becomes an isotope and mass number becomes 274. Then number of $β^{-}$ particles emitted is

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