Grade 12Modern Physics

My question is in the attached image. Please respond.

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D

8 Years agoGrade 12

1 Answer

Sanju

8 Years ago

Sample 1 has a half-life of 1 hrs, so after 6 hrs no of half lives elapsed = 6 half-lives...
Sample 2 has a half-life of 2 hrs, so after 6 hrs no of half lives elapsed = 3 half-lives...

After 6 half lives, the fraction of sample 1 left is 1/(2⁶) = 1/64 ...
The fraction of sample 2 left is 1/(2³) = 1/8....

Since sample 1/sample 2 started out at 2/3, the ratio of sample 1/sample 2 at 6 hrs = [(1/64) / (1/8)]* [2/3] = [1/8]*[2/3] = 1/12...

Required ratio is 1:12 [Option #2 is the answer]

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My question is in the attached image. Please respond.

D

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Sanju

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