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The radioactivity of a certain radioacti...

The radioactivity of a certain radioactive elements
drops to `1/(64)` of its initial value in 30 seconds. Its half life is

A

8 seconds

B

15 seconds

C

7.5 seconds

D

5 seconds

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-NUCLEI-Assignment Section A Objective (One option is correct )
  1. Beta rays emitted by a radicactive material are

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  2. Alpha rays emitted from a radioactive substance are

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  3. In a given reaction, ""(Z)X^(A)to(Z+1)Y^(A)to(Z-1)K^(A-4)to(Z-1)K^(A...

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  4. The radioactivity of a certain radioactive elements drops to 1/(64) ...

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  5. If the half life of a radioactive is T. then the fraction that would r...

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  6. The half-life of a radioactive element which has only 1//32 of its ori...

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  7. The half-life of Bi^210 is 5 days. What time is taken by (7//8)^th par...

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

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  9. Half-life of radioactive element depend upon

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  10. The half-life period of a radioactive substance is 5 min. The amount o...

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  11. Half-lives of two radioactive substances A and B are respectively 20 m...

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  12. Half-life of a radioacitve element is 10 days. The time during which q...

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  13. An element A decays into an element C by a two step process A to B + ....

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  14. During mean life of a radioactive element, the fraction that disintegr...

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  15. The half-life of a radioactive substance against alpha-decay is 1.2 xx...

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  16. The activity of a sample of radioactive material is R(1) at time t(1)a...

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  17. A radioactive substance has an average life of 5 hours. In a time of 5...

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  18. A sample of radioactive element has a mass of 10 g at an instant t=0. ...

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  19. The half-life of a sample of a radioactive substance is 1 h. If 8xx10^...

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  20. A nucleus of mass 220 amu in the free state decays to emit an alpha-pa...

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