nuclei Question 32
Question: Q. 5. (i) Write the process of
(ii) A heavy nucleus splits into two lighter nuclei. Which one of the two - parent nuclei or the daughter nuclei has more binding energy per nucleon?
[Foreign II 2017]
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Solution:
Ans. (i) A nucleus, that spontaneously decays by emitting an electron, or a positron, is said to undergo
[Alternatively, ${ }{\mathrm{Z}}^{\mathrm{A}} X \rightarrow{ }{\mathrm{Z}+1}^{\mathrm{A}} Y+e^{-}+\overline{\mathrm{v}}$ (antineutrino)
${ }{\mathrm{Z}}^{\mathrm{A}} X \rightarrow{ }{\mathrm{Z}-1}^{\mathrm{A}} Y+e^{+}+\mathrm{v}$ (neutrino)
(Any one) 1
During
A neutron converts into a proton and an electron.
[Alternatively,
A proton converts into a neutron and a positron] It is because the neutrinos, or antineutrino, carry off different amounts of energy.
(ii) The daughter nuclei have more binding energy per nucleon.
[CBSE Marking Scheme 2017]
Detailed Answer :
(i) Kindly refer ‘Revision Notes’ of this topic for description of
Radioactive nuclei can emit
Electrons or positrons are emitted in
