6. A radioactive compound produced in a nuclear reaction has a half-life of 10,0

Question

6. A radioactive compound produced in a nuclear reaction has a half-life of 10,000 years. How long will it take until it will be safe to handle it? (a) 25,000 years (b) 50,000 years (c) 100,000 years (d) 250,000 years 7. The Carbon 14 isotope has a lifetime of 5730 years. If a fossil was found with a radioactivity equal to one half of the one generated by living animals, how old is this fossil? (a) 1000 years (b) 5730 years (c) 11460 years (5730x2) (d) 17190 years (5730x3) 8. One kilogram of each of three radioactive compounds are generated in a nuclear reaction. Their half-lives are 10 years for A, 50 years for B, and 100 years for C. After 200 years, which compound will remain with the largest mass? (a) Compound A (b) Compound B (c) Compound C (d) All three will have the same mass 9. In the following nuclear reaction What is the atomic number and identity of nucleus X? (a) go (b) F (e) AC (d) AN

Explanation / Answer

Ans 9.

In this reaction left hand side total atomic number is 9 then total atomic number right hand side will be 9 hence X should have atomic number 8 i.e. oxygen.

Option (a) is correct.

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