Question

If  and  fused to form , there would be

	the loss of a neutron
	a change in mass
	no change in energy
	no change in mass

The half-life of cobalt-60 is 5.26 years. How much time would it take for a sample to drop to 1.00% of its original quantity?

	15 years
	35 years
	26 years
	32 years

The age of a fossil with 41% of the original radioactive C-14 (k=1.2x10^-4 yr^-1) is

	31,000 yr
	7,400 yr
	3,200 yr
	13,000 yr

Answer 1