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+1 vote
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in Physics by (80.8k points)

A nucleus of tritium contains 2 neutrons and 1 proton. If the nucleus undergoes beta decay, emitting an electron, the nucleus is transmuted into

(A) the nucleus of an isotope of helium 

(B) the nucleus of an isotope of lithium 

(C) an alpha particle

(D) a triton 

(E) a deuteron

1 Answer

+1 vote
by (52.5k points)
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Best answer

The correct option is: (A) the nucleus of an isotope of helium 

Explanation:

We start with 2 neutrons and 1 proton. In beta decay with the emission of an electron, the process involves a neutron turning into a proton. The resulting nucleus would have 1 neutron and 2 protons. An atomic number of 2 is defined as He. It is 3He2 which is an isotope of 4He2.

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