This Question: 1 pt 27 of 30 (23 complete) This Test: 30 pts poss The half-life

Question

This Question: 1 pt 27 of 30 (23 complete) This Test: 30 pts poss The half-life of the radioactive element unobtanium-43 is 5 seconds. If 48 grams of unobtanium-43 are initially present, how many grams are present after 5 seconds? 10 seconds? 15 seconds? 20 seconds? 25 seconds? The amount leftafter 5 seconds is grams The amount left after 10 seconds is grams The amount left after 15 seconds is grams The amount left aher 20 seconds isgrams The amount left after 25 seconds is grams Round to one decimai place) 0

Explanation / Answer

half life is 5 seconds

Initial = 48 g

So, after 5 sec, we'd have 48/2 = 24 g remaining

After another 5 sec, i.e after a grand total of 10 sec, 24/2 = 12 remaining

After 15 sec, 12/2 = 6

After 20 sec, 6/2 = 3

After 25 sec, 3/2 = 1.5

So, answers :
24
12
6
3
1.5

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