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#### Atomic and Nuclear physics Two Marks Questions

12th Standard EM

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
15 x 2 = 30
1. What is meant by excitation energy?

2. What is distance of dosest approach?

3. Define impact parameter.

4. Calculate the energy equivalent of 1 atomic mass unit.

5. Give the physical meaning of binding energy per nucleon.

6. What is mean life of nucleus? Give the expression.

7. Define curie.

8. What are the constituent particles of neutron and proton?

9. A fusion reaction is more energetic than a fission reaction. Why?

10. Define Roentgen.

11. Why neutrons in the nucleus are stable?

12. Classify the neutrons according to their kinetic energy.

13. Give the mass number and atomic number of elements on the right-hand side of the decay process $_{ 86 }^{ 220 }{ Rn }$ ⇾ Po + He.

14. Why are heavy nuclei unstable?

15. What is a reactor core?