Learning objective



1) How many protons and neutrons are ther in the nucleus of
a) Oxygen O 18/8
b) tin Sn 120/50

2) For Pb 208/82 find:
a) the net electrical charge of the nucleus.
b) the number of Neutrons.
c) the number of Nucleons.
d) the approximate radius of the nucleus.
e) the nuclear density.

2) The earth revolves around the sun, and the two represent a bound system that has a binding energy of 2.6 x 10^33 J. Suppose that the earth and the sun were completely separated, so that they were infinitely far apart and at rest. What would be the difference between the mass of the separated system and that of the bound system?

3) Find the energy (in MeV) is released when
 α decay converts radium Ra 226/88 (atomic mass = 226.025 40 u) into radon Rn 222/86 (atomic mass = 222.017 57 u). The atomic mass of an α particle is 4.002 603 u.

4) Plutonium Pu 239/94 (atomic mass = 239.052 16 u) undergoes α decay. Assuming that all the released energy is ion the form of kinetic energy,of the
 α particle (atomic mass = 
4.004 603 u) and ignoring the recoil of the daughter nucleus (U 235/92, atomic mass = 235.043 924 u) , find the speed of the α particle. Ignore relativistic effects.