A geologist is studying two different rhyolite flows to determine if they were erupted at the same time.

9)Rhyolite #1 has 50% of the parent Isotope F remaining. How many half lives have occurred?
10)Rhyolite #2 has 75% Daughter G and 25% parent H. How many half lives has the rock gone through?
11)Parent Isotope F in the first question has a half life of 100 million years. Use your answer from question 9 to determine the age of rhyolite#1.

Question

A geologist is studying two different rhyolite flows to determine if they were erupted at the same time. 

9)Rhyolite #1 has 50% of the parent Isotope F remaining. How many half lives have occurred?
10)Rhyolite #2 has 75% Daughter G and 25% parent H. How many half lives has the rock gone through?
11)Parent Isotope F in the first question has a half life of 100 million years. Use your answer from question 9 to determine the age of rhyolite#1.

unklerhaukus · Answer

9) after 1 half life, half reamin

anonymous · Answer

10) 2 half-life occurs. Refer to the magic candy question to see why. 
11) If one half life has occurred and one half life last 100 million years, how old is it?