which two statements describe the relationship between energy and work? O A. Work is the energy absorbed by an object that is not moving. O B. Energy is the rate at which work is done on an object. C. Work is a transfer of energy from one object to another. D. The same unit of measurement is used for energy and for work. PLEASE I NEED HELP!

Bis the

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Deposition  is  change of state has the wrong energy change listed