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For a sample of $β -$ active material, which of the following is /are incorrect?

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The Beta particles emitted have same energy

The atomic number of the active nucleus remain same in $β -$ decay

The antineutrino emitted in a $β -$ decay has zero momentum

The active nucleus changes into one of its isobars after the Beta–decay

answer is A, B, D.

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Detailed Solution

Anti neutrino has negligible momentum not necessary zero (due to its negligible mass).

Due to $β$ decay , atomic number changes but mass number remains the same .

$E n e r g y o f β^{-} p a r t i c l e s v a r i e s f r o m z e r o t o s o m e m a x i m u m v a l u e a n d e n e r g y o f β^{+} p a r t i c l e s v a r i e s f r o m a m i n i m u m n o n z e r o v a l u e t o a m a x i m u m v a l u e .$

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