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kelly3215
19.03.2021 •
Mathematics
What is the value of m2 - 2m17+172 for m=-2 and 17=
4?
36
4
36
Solved
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Ответ:
4.62 hrs
Step-by-step explanation: there is 1g of pb-209 present and it's half life (time to reduce to it's half value) is 3.3 hours.
Half of the original value = 1g/2
= 0.5g
So
0.5g = 3.3 hrs
Now 70% of 1g is 0.7g
Value of pb-209 remaining at 70% removed is 1-0.7=0.3g
So the Time to decay to 0.3g is
=(0.7*3.3)/0.5
=2.31/0.5
= 4.62 hrs