Nuclear fusion reactions require very temperatures so as to overcome :

Options

A. van der Waals' forces
B. Nuclear forces
C. Gravitational forces
D. Coulomb forces

Answer

D

Explanation

Nuclear fusion is not possible at ordinary temperature and oridinary pressure. The reason is that when the nuclides approach each other, due to their positive charge the electrosatic force of repulsion between them becomes too strong that they do not fuse. Hence, to make the fusion possible a high temperature `(=10^(7)K)` and high pressure is required. At such a high temperature the nuclides due to thermal agitations acquire sufficient kinetic energy, so as to overcome the force of repulsion between them when they approach each other and so they get fused .