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Roughly how many alpha particles bounced back?
A1 in 10,000
B1 in 30,000
C1 in 40,000
D1 in 20,000
Answer & Solution
Correct answer: D. 1 in 20,000
1. The third observation was the most surprising.
2. About 1 in 20,000 alpha particles bounced back.
3. So the correct answer is 1 in 20,000.
_Source: syllabus Chemistry, Ch 2 'Structure of Atom'_
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