Question

PHYS 3606 n Name ArDA 1CEL TEST 3 Formulae and Constants The semi-empirical binding energy formula is given by: (Z- N a +E- A B-aA-aA a A A Lif Z and N are even where e-0 if Z or N is even, the other odd -I if Z and N are both odd where apol 11.2 MeV 15.75MeV, aur-17.8 MeV, aceel 0.711 MeV, aym 23.7 MeV and apair p-1.007825u 938 3 MeV/c 1.673 x 10kg n-1.008665u =1.67x10 kg =939.6 MeV/e 1. [3 marks] On the grid below sketch a chart of the nuclides labeling: (a) the axes (b) a line where Z-N, (c) general shape of curve representing stable nuclides, (d) general shape of the observed unstable nuclei, (e) arrows indicating direction of beta decay, positron decay, alpha decay (eg. if a parent X underwent alpha decay 4tY draw an arrow from the position of the parent nuclide to the daughter). to

If you can answer all parts clearly, it would be much appreciated.

Answer 1

100 90 80 70 Proton 60 number 50 30 10 0 10 20 30 50 60 70 80 90 100 110 120 130 140 150 Neutron number, N 40 40 20 N

The above graph shows:

1. The axes marked by the Neutron number, N as the abscissa and the Proton number, Z representing the ordinate.
2. The straight line shows the nuclei for which N=Z.
3. The dark regions in the plot show the general shape of plot for stable nuclei.
4. The light regions represent the unstable nuclei or radioactive nuclei.