1. The isotope generally used for the treatment of cancer is:

2. What percentage of radioactive substance is left after 5 half lives?

3. Mass is converted into energy according to the relation:

4. The helium atom does not contain

5. The more readily fissionable isotope of uranium has an atomic mass of:

6. Energy of electron in the 1st orbit of H-atom is:

7. The mass no. of a nucleus is M and its atomic no. is Z. The number of neutrons in the nucleus is :

8. The phenomena of radioactivity is:

9. When one gm of mass is converted into energy, it is equal to:

10. In the given reaction:
\(_{Z}^{A}\)X → \(_{Z+1}^{A}\) Y → \(_{Z-1}^{A-4}\) K → \(_{Z-1}^{A-4}\) K radioactive radiations are emitted in the sequence