Mathematics, 12.08.2020 06:01 amandagewecke88

An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 70% more of the substance? (Round your answer to one decimal place.) hr

Answers

Answer from: pillgiing

Step-by-step explanation:

half life time-50%-8.4hr

so for 10%- 8.4/5=1.68 hr

now for 70%

1.68 × 7 = 11.76 hrs

to one decimal place - 11.8hrs

Answer from: vjmfghhh

201 on has a half of 84 hours because it mostly to and make Sense

Answer from: Quest

3x + 18 = 147°

step-by-step explanation:

3x + 18 = 147°, because the value of the central angle is equal to the value of the arc formed by it.

i hope i you.

Answer from: Quest

step-by-step explanation:

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An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 70% more of th...