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16. 17. 18. 19. 20. The radius of a proton is about 1 fm. using the results of problem 15; calculate the density of the proton in g/cm3. The binding energy of the H-atom is 1.8 x 108 u. The mass of the proton is 1.007276 u and that of the electron is 00005485799 It. Find the mass of the H-atom in kg. Find the density of the H-atom from the results of problem 17 and assume its diameter is 1 A. Compare this density with that of the proton. The lifetime of the positive pion1 a subatomic particle, is 26 ns. Convert this lifetime to minutes. Half-life of a given radioactive substance is dened as the time it takes for the substance to decay to half of its original mass. If the half-life of 5000 is 5.7 years and we start with 1.0 g of 6000, how much 6000 would we have left after three halflives