State the S.I. unit of radioactivity.
or
What change will occur in atomic number if one β-particle is emitted from
92U235?
WBBSE
Class X
Physical Science
Atomic Nucleus
01 Mark
2025
Becquerel / Bq
Explanation:
The S.I. unit of radioactivity is the becquerel (Bq), which measures the rate of radioactive decay as one disintegration per second.
or
Increased by 1 / Atomic no. will be 93.
Explanation: β-particle emission is the ejection of an electron from the nucleus, converting a neutron to a proton, thus increasing the atomic number by 1. For 92U235, it becomes 93Np235
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