Thermodynamic arguments put the current number density of these background neutrinos at . If only one species of neutrino has mass, what must its mass be if it makes up dark matter

On your wedding day your lover gives you a gold ring of mass 3.67 g. 48 years later its mass is 3.44 g. on the average how many atoms were abrated from the ring during each second of your marriage? the atomic mass of gold is 197 u. don't enter units