(i) Write down an expression for the heat Q required to melt a mass m of water.
(ii) If a nucleus disintegrates through alpha decay, then how the released energy is associated to the reduction in mass which accompanies the decay?
(iii) Throughout alpha decay, the energy liberated by each disintegration is E. Determine the net energy ETotal liberated by a number n of disintegrations?
(iv) When the number of radioactive nuclei present initially is N0, determine the number of disintegrations which take place in one half-life?