A moon rock sample has been analysed using mass spectrometric, the sample shows that the ratio of the number of stable 40Ar (argon) atoms to the number of 40K (potassium) atoms is 10.3. Assume that all the argon atoms were produced by decay of potassium atoms, half-life of 40K is 1.25 109 years. Determine the age of the rock. (8 marks

Estimate the volume of a 40Ar nucleus. Given that R0 = 1.22 fm. 5 marks

Explain electron-nuclei inelastic interaction and state TWO factors that increase the probability of the interaction. (10 marks)