3. Since the density of water is ρ= 1000 kg/m3= 1 kg/L, then the total mass of the pool is ν= 4.32 ×105kg, where νis the given volume. Now, the fraction of that mass made up by the protons is 10/18 (by counting the protons versus total nucleons in a water molecule). Consequently, if we ignore the effects of neutron decay (neutrons can beta decay into protons) in the interest of making an order-of-magnitude calculation, then the
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