QUESTION 4 The pairing energy term in the semi-empirical mass formula is there b
ID: 1879264 • Letter: Q
Question
QUESTION 4 The pairing energy term in the semi-empirical mass formula is there because: Each proton must be paired with a neutron O Each proton must be paired with an electron. The semi-empirical mass formula was not complicated enough, so an extra term was thrown in to beef it up a bit. Nuclei tend to arrange themselves so that they avoid having odd numbers of protons and odd numbers of neutrons together. QUESTION 5 How does a heavy nucleus stabilize itself given the repulsive force of the protons present? O The protons all group into a single ball surrounded by a shell of neutrons. Electrons are absorbed into the nucleus to counteract the positive charge of the protons. O Neutrons are present (in excess) to provide additional sources of the attractive strong force. The strength of the positive electrical charge of the individual protons is scaled back through a feedback mechanism.Explanation / Answer
4) correct ans is option (4) since nuclei with even no of protons and neutrons are most stable while with odd no of neutrons and protons are unstable.
5) Inside the nucleus a short range strong nuclear attractive force is present between protons and neutrons which keep the nucleus at stable position.
Hence to compensate the repulsive proton forces neutrons are present inside it.
Correct option is (3).