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The radioisotope , tritium (""(1)^(3)H) ...

The radioisotope , tritium `(""_(1)^(3)H)` has a half-life of 12.3 years. If the initial amount of tritium is 32 mg , how many milligrams of it would remain after 49.2 years ?

A

8 mg

B

1 mg

C

2 mg

D

4 mg

Text Solution

Verified by Experts

The correct Answer is:
C
No. of half lives, `n=(49.2)/(12.3) = 4`
`N_(0) = 32` mg
`N=(N_(0))/(2^(n)) =(32)/(2^(4))` mg
`=(32 mg)/(16)=2 mg `
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