25 MOST IMPORTANT QUESTION AND ANSWER FOR CHSE 12TH PHYSICS CHAPTER- ATOMS AND NUCLEI.

Weightage 6 Marks

Atom –

Alpha- particle scattering experiment, Rutherford’s model of atom, its limitations, Bohr model, energy levels, hydrogen spectrum.

Nuclei:

Atomic nucleus, its composition, size, nuclear mass, nature of nuclear force, mass defect, binding energy per nucleon and its variation with mass number, nuclear fission, fusion, Radioactivity, alpha, beta and gamma particles/ rays and their properties, radioactive decay law, half life and decay constant.