Question

Assertion (A) : Nuclear fission reactions are responsible for energy generation in the Sun. Reason (R) : Light nuclei fuse together in the nuclear fission reactions.

State Bohr's postulates and derive an expression for the energy of electron in nth orbit in Bohr's model of hydrogen atom.

Calculate binding energy per nucleon (in MeV) of ¹²₆C. Given : m(¹²₆C) = 12.000000 u, m(¹₀n) = 1.008665 u, m(¹₁H) = 1.007825 u

Draw a diagram to show the variation of binding energy per nucleon with mass number for different nuclei and mention its two features. Why do lighter nuclei usually undergo nuclear fusion ?