Physics
(a) An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an α-particle and is transformed into a nucleus B. What is the composition of B?
(b) The nucleus B emits a β-particle and is transformed into a nucleus C. What is the composition of C?
(c) What is the mass number of the nucleus A?
(d) Does the composition of nucleus C change if it emits the γ radiation?
Radioactivity
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Answer
(a) The composition of B is 82 protons and 126 neutrons.
Explanation: When the nucleus A emits an α-particle, the resulting nucleus B has 2 protons and 2 neutrons less than the original nucleus.
(b) The composition of C is 83 protons and 125 neutrons.
Explanation: When the nucleus B emits a β-particle, the resulting nucleus C has 1 proton more and 1 neutron less than the nucleus B.
(c) The mass number of nucleus A = number of protons + number of neutrons = 84 + 128 = 212.
(d) No, the composition of nucleus C does not change on emitting γ radiations as there is no change in the mass number A and atomic number Z of the nucleus in gamma emission.
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