✓ Board-verified
Physics · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q27
(a) Show the variation of binding energy per nucleon with mass number. Write the significance of the binding energy curve. (b) Two nuclei with lower…
(a)
Show the variation of binding energy per nucleon with mass number. Write the significance of the binding energy curve.
(b)
Two nuclei with lower binding energy per nucleon form a nuclei with more binding energy per nucleon.
(i)
What type of nuclear reaction is it?
(ii)
Whether the total mass of nuclei increases, decreases or remains unchanged?
(iii)
Does the process require energy or produce energy?
Marking-scheme solution
(a)
Significance of the binding energy curve:
Why lighter nuclei undergo fusion and heavier nuclei undergo fission.
Nuclear forces are short ranged.
Energy is released in both nuclear fission and nuclear fusion.
(b)(i)
Nuclear fusion
(ii)
Decreases
(iii)
Energy is produced
More from Nuclei
- Calculate the energy released/absorbed in the following nuclear reaction: _6^12 C+_6^12 C →_10^20 Ne+_2^4 He Given: m(_6^12 C)=12 · 000000 u m(_10^20…2024 · asked 2×
- Two nuclei have their mass numbers in the ratio of 8: 1. The ratio of their nuclear densities is:2023
- Briefly explain how energy is produced in stars, giving two examples of the nuclear reactions involved.2025
- A narrow beam of protons, each having 4.1 MeV energy is approaching a sheet of lead (Z=82). Calculate: (i) the speed of a proton in the beam, and…2022
- Explain the terms mass defect and binding energy. How are they related?2026
- Deuterium undergoes the following fusion reaction: _1^2 H+_1^2 H →_2^3 He+_0^1 n+3.27 MeV How long an electric bulb of 200 W will glow by using the…2024
- (i) Prove that the nuclear density is same for all nuclei. (ii) Draw a plot of potential energy of a pair of nucleons as a function of their…2023
- Calculate the binding energy per nucleon (in MeV ) of a helium nucleus ( _2^4 He ). Given: m(_2^4 He)=4 · 002603 u m_n=1.008665 u; m_H=1.007825 u; 1…2025
CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.