Nuclei - Result Question 72
73. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
[2009]
(a) isomer of parent
(c) isotope of parent
(b) isotone of parent
(d) isobar of parent
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Answer:
Correct Answer: 73. (c)
Solution:
- (c) A radioactive substance when emits one alpha particles $( _2^{4} He)$, its mass number reduces by 4 and charge no. reduces by 2 and after emission of two $\beta$-particles its charge no. increase by 2 thus the charge no. i.e. atomic number remains the same.
Isotopes of an element have the same atomic number but different mass number.
