A radioactive isotope of potassium has a half-life of 20 minutes if a 40 g sample of this isotope is allowed to decay for 80 minutes how many grams of the r adioactive isotope will remain

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asked Nov 24, 2019 99.8k views

5 votes

A radioactive isotope of potassium has a half-life of 20 minutes if a 40 g sample of this isotope is allowed to decay for 80 minutes how many grams of the r

adioactive isotope will remain

Physics
high-school

Karim Sinouh asked

by Karim Sinouh

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2 Answers

1 vote

Answer:

It's 2.5 mates

Step-by-step explanation:

Jut did it on USATestPrep

Flex Texmex answered Nov 25, 2019

by Flex Texmex

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5 votes

There will be 2.5g left.

Explanation:

80/20 = 4 half lives

40/2 = 20

20/2 = 10

10/2=5

5/2 = 2.5

PJ Bergeron answered Nov 29, 2019

by PJ Bergeron

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