Same chapter1 markDifficulty: Medium
When a nucleus emits a beta particle, its atomic number:
Radioactivity
3 marksDifficulty: Medium
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.
Original Khojo Papers practice question — not from a past board paper.
Answer
Atomic number 91 and mass number 234
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
In beta emission a neutron becomes a proton and an electron, which is emitted. The atomic number therefore rises by 1 while the mass number is unchanged.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Distinguish between nuclear fission and nuclear fusion.
Radioactivity
Same chapter3 marksDifficulty: Medium
The half-life of a radioactive substance is 5 years. What fraction of an initial sample remains undecayed after 20 years?
Radioactivity
Same chapter3 marksDifficulty: Medium
State two harmful effects of exposure to radiation and two safety precautions taken when handling radioactive material.
Radioactivity
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.
Radioactivity
Same chapter1 markDifficulty: Medium
After three half-lives the fraction of a radioactive sample left undecayed is:
Radioactivity