Suppose we have 12 protons and 12 neutrons. We can assemble them to form either a `^24 Mg` nucleus or two `^12 C` nuclei. In which of the two cases more energy will be liberated?

Suppose we go 200 km above and below the surface of the Earth, what are the g values at these two points? In which case, is the value of g small?

Calculate the energy released when three alpha particles combine to form a _^12 C nucleus. The atomic mass of _^4 He is 4.002603 u .

In a fusion reactor, the reaction occurs in two stages. (i) Two deuterium (""_(1)^(2)D) nuclei fuse to form a tritium (""_(1)^(3)T) nucleus with a proton as product. (ii) A tritium nucleus fuses with another deuterium nucleus to form a helium (""_(2)^(4)He) nucleus with neutron as another product. Find (a) the energy released in each stage. (b) the energy released in the combined reaction per deuterium and (c) what percentage of the mass energy of the initial deuterium is released? Given : ""_(1)^(2)D=2.014102u,""_(1)^(3)T=3.016049u,""_(2)^(4)He=4.002603u,""_(1)^(1)H=1.007825u,""_(0)^(1)n=1.008665u Take 1u = 931 MeV

Calculate the electric potential energy due to the electric repulsion between two nuclei of _^(12)C when they touch each other at the surface.

How many terms of the A.P. 16,14,12,….are needed to obtain the sum 60 ? Explain why we get two answers.