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The radioactivity of an old sample of wh...

The radioactivity of an old sample of whisky due to tritium (half life 12.5 years) was found to be only about 3 % of that measured in a recently purchased bottle marked 7 year 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 ENGLISH-NUCLEAR PHYSICS-Exercise 2 Part-1 Only one option correct type
  1. Choose the wrong statement

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  2. Binding energy per nucleon of fixed nucleus X^(A) is 6 MeV. It absorbs...

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  3. The half-life of .^215At is 100mus. The time taken for the activity of...

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  4. A fre neutron decays into a proton an electron and

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  5. Protons and singly ionized atoms of U^(235) & U^(238) are passed in tu...

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  6. When a beta-particle is emittd from a nucleus , the neutron - proton...

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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 particle is 48 MeV and ...

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  10. A free ^238U nucleus kept in a train emits an alpha particle. When the...

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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=O, some radioactive gas is injected into a sealed vessel. At...

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  14. A sample of radioactive material 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 amount) P and Q of a rad...

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  17. N atoms of a radioactive element emit n number of alpha-particles per ...

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  18. The radioactivity of an old sample of whisky due to tritium (half life...

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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 elapsed...

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