Physics · May / June 2017 · Paper 12 · Question 40
What happens to the proton number (atomic number) of a nucleus as it emits an alpha-particle?
- AIt decreases by one.
- BIt decreases by two.
- CIt decreases by four.
- DIt does not change.
As printed in the paper
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Correct answer: B. It decreases by two.
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