Question 1
The half-life of carbon-14 is 5730 years. The 14C/12C ratio has decreased to 6.25% of its original value, indicating that the object is at least 20,000 years old.
◦ true
◦ false
Question 2
The mass defect arises because the sum of masses of the component nucleons is less than that of the nucleus.
◦ true
◦ false