What are delayed neutrons ?

What are thermal neutrons ? What is their importance ?

The charge on a neutron is

A person is suffering from improper formation of bones, knockness, swollen wrists and delayed dentition what might be the reason ?

A person suffering from improper formation of bones, knockness, swollen wrists and delayed dentition. What might be the reason ?

What is the value of neutron multiplication factor in a controlled reaction and in an uncontrolled chain reaction ?

The half life of neutron is 693 seconds. What fraction of neutrons will decay when a beam of neutrons, having kinetic energy of 0.084 eV, travells a distance of 1 km? (mass of neutron 1.68 xx 10^(-27) kg, and In 2=0.693)