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the disintegration rate of a certain r...

the disintegration rate of a certain radioactive sample at any intsant is 4750 disintegration per minute , five mionutes later the rate becomes 2700 per minute ,calculate
(i) decay constant and (ii) half -life of the sample .

A

30 minutes

B

61 minutes

C

`47.8` minutes

D

`33.3` minutes

Text Solution

Verified by Experts

The correct Answer is:
A
`r_(1)=lamdaN_(1)`
`8100=lamdaN_(@)`
`2700=lamdaN_(t)`
`lamda=(2.303)/50 "log" (N_(@))/(N_(t))=(0.693)/(t_(1//2))`
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