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Question

- 80min
- 120min
- 20min
- 30min

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Solution

Verified by Toppr

N=N0(12)t/T1/2

∴30=240(12)60/T1/2

[∵t=1h=60min]

or 30240=(12)60/T1/2

or (12)3=(12)60/T1/2

Comparing the powers, we get

∴60T1/2=3

T1/2=603

or T1/2=20min.

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