The spectral series of hydrogen that lies in the visible region is:

A mass defect of 0.01 amu corresponds to approximately $x$ MeV. Nearest integer $x$:

The energy equivalent of 1 amu is approximately:

Binding energy per nucleon is maximum for nuclei around:

Nuclear fission of heavy nuclei and fusion of light nuclei both release energy because the binding energy per nucleon of the products…

The energy source of the sun is primarily: