Explain nuclear reactions, nuclear fission and nuclear fusion.

Nuclear reaction is a reaction in which nucleus of the atom undergoes a change.

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

Example :

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

Example:

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue