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In a RA element the fraction of init...

In a RA element the fraction of initiated amount remaining after its mean life time is :

A

`1 - (1)/( e )`

B

`(1)/( e^(2))`

C

`(1)/( e )`

D

`1 -(1)/( e^(2))`

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-RADIOACTIVITY & NUCLEAR PHYSICS-Exercise -1
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  6. The activity of a radioactive sample drops fo 1//32 of its initi...

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  7. A radioactive material emits 20 beta - perticles per sec . At 10...

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  8. We get N(1) and N(2) beta- perticles per second from two specimen...

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  9. There are two radio nuceli A and B. A is an alpha emitter and B a beta...

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  10. The number of alpha and beta- emitted during the radioactive decay cha...

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  11. When .90 Th^228 transforms to .83 Bi^212, then the number of the emitt...

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  12. A radioactive nucleus undergoes a series of decay according to the sch...

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  13. The particles not emitted by radioactive susbstace are:

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  14. gamma- rays are produced ………. , alpha or beta- decay

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  15. The particle emitted in the nuclear reaction .(Z) X^(A) = .(Z+1)...

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  16. By neutrino hypothesis which conservation law for beta- decay c...

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  17. During a negative beta decay,

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  18. In a given magnetic field for the particle less of same velocit...

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  19. A nucleus with mass number m and atomic number n, emits one al...

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  20. The intensity of gamma- from a source (I(0)) reduces to I(0)//8 af...

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