Match the statement in Column I to the appropriate statement(s) from Column II.

Answer

`(Ato r;s Bto q; Cto p; Dto p)`

Explanation

(i) stability of nucleus is decided by neutron-proton ratio , packing grachtion and binding energy per nucleon .
(ii) for radioactive substance binding energy per nucleon is minimum . So they are unstable .
(iii) for bound orbit , total energy is always nagative .
(iv) stopping potential is the particular negative potential when no electron reches the plate .