Atoms & Nuclei Theoretical Important Questions in Physics for Class-XII Pdf Download

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Atoms And Nuclei

Chapter 12 : Atoms
Alpha particle scattering experime
Rutherford’s models of an atom.
Bohr’s model of an atom.
Energy level.
Hydrogen spectrum.

Chapter 13 : Nuclei
Composition and size of
Nucleus
Atomic masses
Isotopes
Isomers
Radioactivity alpha, beta and gamma particles/rays and their properties.
Radioactivity decay law.
Binding energy per Nucleon and it’s variation with mass number.
Nuclear fission
Nuclear fussion

Atoms & Nuclei

1. State Bohr’s postulates for explaining the spectrum of hydrogen atoms.

2. Obtain Bohr’s Quantization condition on the basis of the wave picture of an electron.

3. Using Bohr’s postulates derive an expression for the radii of the permitted orbit in the

hydrogen atoms. Also obtain an expression for the total energy of an electron in the nth

orbit of an atom. What does negative value of this energy signify?

4. Show that the speed of an electron in the innermost orbit of hydrogen atom is 1/137

times the speed of light in vacuum.

5. How is the size of a nucleus estimated? Write the relation between the radius of a

nucleus and its mass number.Also prove that the nuclear density is same for all nuclei.

6. Draw a plot showing the variation of binding energy per nucleon with mass number A.

Write two important conclusions which you can draw from this plot. Explain with the

help of this plot,the release in energy in the processes of nuclear fusion and fission.

7. State the law of radioactive disintegration. Using this law, show that the radioactive

decay is exponential in nature.

8. Define the terms decay constant and half-life of a radioactive sample. Write their units.

Derive the relation between them.


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