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Assertion (A) : Radioactive nuclei emit ...

Assertion (A) : Radioactive nuclei emit `beta`- particles whose charge and rest mass are exactly same as that of electrons .
Reason (R) : Electrons exists inside the nucleus .

Text Solution

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Electrons do not exist in nucleus . At the time of `beta` - decay , a neutron is transformed into a proton and electron comes out as `beta`- particle.
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