AP · AP 2 · multiple choice
AP Physics 2: Algebra-Based · Question 6
AP Physics 2: Algebra-Based · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- routine
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
A nucleus of ²³⁸₉₂U decays to ²³⁴₉₀Th. What particle is emitted?
- A
an alpha particle
- B
a beta-minus particle
- C
a beta-plus particle
- D
a gamma photon
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Answer overviewCorrect answer: A — an alpha particle
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is A: an alpha particle
- 2
The mass number falls by 4 and the atomic number by 2, which only an alpha particle can do. D leaves both numbers unchanged.
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