Same chapter3 marksDifficulty: Medium
State two harmful effects of exposure to radiation and two safety precautions taken when handling radioactive material.
Radioactivity
3 marksDifficulty: Medium
Distinguish between nuclear fission and nuclear fusion, giving one example of each.
Original Khojo Papers practice question — not from a past board paper.
Answer
In nuclear fission a heavy nucleus such as uranium-235 splits into lighter nuclei when struck by a neutron, releasing energy. In nuclear fusion light nuclei such as hydrogen combine to form a heavier nucleus, as happens in the sun, also releasing energy. Fission needs no very high temperature to start, while fusion requires extremely high temperature and pressure.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Both release energy because the products have a greater binding energy per nucleon than the reactants.
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A nucleus of atomic number 90 and mass number 234 emits a beta particle. Write the atomic number and mass number of the nucleus formed.
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Same chapter3 marksDifficulty: Medium
A nucleus of atomic number 92 and mass number 238 emits an alpha particle. Write the atomic number and mass number of the nucleus formed.
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Same chapter1 markDifficulty: Medium
When a nucleus emits a beta particle, its atomic number:
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