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The radioactivity of a given sample of w...

The radioactivity of a given sample of whisky due to tritium (half life `12.3` years) was found to be only `3 %` of that measured in a recently purchased bottle marked `''7` years old''. The sample must have been prepared about.

A

`70` year

B

`220` year

C

`420` year

D

`300` year

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The correct Answer is:
A
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RESONANCE-NUCLEAR PHYSICS-Exercise 2 Part-1 Only one option correct type
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  3. The half - life of ^(215) At is 100 mu , s.The time taken for the radi...

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  4. A free neutron decays to a proton but a free proton does not decay to ...

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  5. Proton and singly ionized of U^(235) & U^(238) are passed in turn (whi...

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  6. When a beta^(-) particle is emitted from a nucleus, the neutrons-proto...

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  7. Consider a sample of a pure beta-active material

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  8. Masses of two isobars .(29)Cu^(64) and .(30)Zn^(64) are 63.9298 u and ...

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  9. In an alpha -decay, the kinetic energy of alpha-particles is 48 MeV a...

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  10. Free ^238 U nuclei kept in a train emit alpha particles. When the trai...

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  11. A nucleus with mass number 220 initially at rest emits an alpha-partic...

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  12. A charged capacitor of capacitance C is discharged through a resistanc...

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  13. At time t=0, some radioactive gas is injected into a sealed vessel. At...

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  14. A sample of radioactive meterial has mass m, decay constant lambda, an...

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  15. Two radioactive substances X and Y initially contain an equal number o...

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  16. Two identical samples (same material and same amout) P and Q of a radi...

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  17. N atoms of a radioactive element emit n alpha particles per second. Th...

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  18. The radioactivity of a given sample of whisky due to tritium (half lif...

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  19. A overset(lambda(1)) rarr B overset (lambda(2))rarr C t=0 N(0) 0 ...

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  20. 90% of a radioactive sample is left undecayed after time t has elapese...

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