Physics
The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter nucleus is :
- isotope of the parent
- isobar of the parent
- isotone of the parent
- None of the above
Answer
isotope of the parent
Reason — When an alpha particle is emitted, the mass number decreases by 4 and the atomic number decreases by 2 while each beta particle emission increases the atomic number by 1 without changing the mass number.
If the number of beta emissions is twice that of alpha emissions, then for one alpha decay (−2 in atomic number), two beta decays (+2 in atomic number) occur, resulting in no net change in atomic number.
However, the mass number still decreases due to alpha decay so, the daughter nucleus has the same atomic number but a different mass number, meaning it is an isotope of the parent.
Hence, the resulting daughter nucleus is an isotope of the parent atom.
Related Questions
A radioactive nucleus emits a beta particle. The position of daughter nucleus in the periodic table as compared to the parent nucleus after emitting a beta particle is :
- at the same place
- one place higher
- one place lower
- two places lower
The electron emitted in beta radiation originates from :
- outer orbit of the atom
- inner orbit of the atom
- free electron existing in the nucleus
- decay of the neutron in the nucleus
Assertion (A): Out of α, β and γ radiation, α-particles have maximum penetrating power.
Reason (R): The α-particles are the heaviest amongst the three.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.