Nuclear Physics

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. is the traditional unit of radioactivity.
2. It is The SI unit of radioactivity is .
3. The radiation exposure of x-rays is measured by another unit called .
4. When a radioactive element emits an particle, a daughter nucleus is formed whose mass number is less by 4 units and the atomic number is less by 2 units, than the mass number and atomic number of the parent nucleus.
5. When a radioactive element emits a particle, a daughter nucleus is formed whose mass number is the same and the atomic number is more by 1 unit, than the atomic number of the parent nucleus.
6. In a nuclear reaction, the element formed as the product nucleus is identified by the of the resulting nucleus.
7. The process of breaking (splitting) up of a heavier nucleus into two smaller nuclei with the release of a large amount of energy and a few neutrons is called .
8. A fissionable material is a radioactive element, which undergoes fission in a sustained manner when it absorbs a .
9. There are some radioactive elements, which can be converted into fissionable material. They are called as materials.
10. A is a self-propagating process in which the number of neutrons goes on multiplying rapidly almost in a geometrical progression.