  Top 10 Questions

## Nuclei

- Running short of time? Practice top 10 questions of the chapter and boost your confidence.
1
Define mass defect of a nucleus. Binding energy of is . Write the value of its 'binding energy per nucleon'. Write the value of energy in joule.
State the law of radioactive decay. Hence derive the expression where symbols have their usual meanings.
(a) Write the characteristic properties of nuclear force.
(b) Draw a plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from the graph
Bombardment of Beryllium by alpha particles resulted in the discovery of :
A
Proton
B
Nucleus
C
Neutron
D
Positron
(a) What do you mean by value of a nuclear reaction?
(b) Write down the expression for value in the class of decay.

Plot a graph showing the variation of undecayed nuclei versus time . From the graph, find out how one can determine the half-life and average life of the radioactive nuclei.
Explain the principle and working of a nuclear reactor with the help of a labelled diagram.
Distinguish between nuclear fission and fusion. Show how in both these processes energy is released. Calculate the energy release in MeV in the deuterium-tritium fusion reaction :

Using the data:

Why nuclear fusion reaction is also called thermo-nuclear reaction?
Write symbolically the nuclear decay process of . Is the decayed product X an isotope or isobar of ()? Given the mass values m () = 11.011434 u and m (X) = 11.009305 u. Estimate the Q-value in this process.