A piece of radioactive material contains 1020 atom...
A piece of radioactive material contains 1020 atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is?
3.47 x 1018
6.93 x 10 20
3.47 x 1020
6.93 x 1018
Correct answer is A
The number of disintegration,∆N in time interval At, is given by
- ∆N = N∆t
Where N is the number of atoms present at the time t
But ^ = (0.693)/T
= 0.693 ÷ 20
= 0.0347
∴ ∆N = 0.0347 × 1020
= 3.47 × 1018
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