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A fraction of (5)/(9) of a radioactive...

A fraction of `(5)/(9)` of a radioactive substance decays in time. What fraction of the substance would had been active after time `(1)/(2)`

A

`1//2`

B

`2//3`

C

`3//4`

D

`4//5`

Text Solution

Verified by Experts

The correct Answer is:
B
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MOTION-RADIOACTIVITY & NUCLEAR PHYSICS-Exercise -1
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  2. The decay constant of the end product of a radioactive series is

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  3. A fraction of (5)/(9) of a radioactive substance decays in time. ...

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  4. If the quantify of radioactive material reduces by 10% in 5days...

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  5. The activity of a sample reduces from A(0) "to" (A(0))/(sqrt(3)) in on...

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  6. Half life of radium is 1620 years . How many radium nuclei dec...

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  7. A radioactive sample at any instant has its disintegration rate 5000 d...

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  8. 90% of a radioactive sample is left undecayed after time t has elapese...

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  9. A radio active sample contains 10^(6) radioactive nucleus it s h...

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  10. 1 mg radium has 2.68 xx 10^(18) atoms. Its half-life is 1620 years. Ho...

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  11. If the activity of radioactive sample drops to 1//32 of its initi...

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  12. A freshly prepared radioactive source of half life period of 2 hour em...

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  13. A radioactive sample contains two elements P and Q . The mass ...

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  14. The radioactive sources A and B of half lives of 2hr and 4hr respectiv...

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  15. The half life of polonium is 140 days. In what time will 15 g of polon...

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  16. The half life of radium is 1600 years . In how much time will ...

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  17. Calculate the half life period of a radioactive substance if its activ...

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  18. When 64 gms of a radioactive element are carried from Jaipure t...

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  19. A radioactive element with mass 8 gm and haslf life 100 second ...

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  20. The activity of a radioactive elements (decay constant lambda) ...

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