(i) What characteristic property of nuclear force explains the constancy of binding energy per nucleon (BE/A) in the range of mass number 'A' lying 30 < A < 170 ?
(ii) Show that the density of nucleus over a wide range of nuclei is constant-independent of mass number A. 3mark
(i) Saturation / short range nature of nuclear forces. 1mark
(ii) We have
∴ Density 1/2mark
Hence is independent of A
(here m is the mass of the nucleus.) 1/2mark