TOTUOLIO PUCILIUL VIOTY
Score: 0 of 1 pt
13 of 15 (13 complete)
HW Score: 73.33%, 11 of 15 pts
X 9.C.43
Question Help
A certain element has a half life of 25 billion years
a You find a rock containing a mocture of the element and lead. You determine that 55% of the original element remains the other 45% decayed into lead. How old is the
rock?
b. Analysis of another rock shows that it contains 20% of its original element, the other 80% decayed into lead How old is the rock?
a The rock is approximately billion years old
(Round to one decimal place is needed)
Incorrect: 2