| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.SL.TZ1.22 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 22 | Adapted from | N/A |
Question
Geiger and Marsden bombarded a thin gold foil with alpha particles. They observed that a small fraction of the alpha particles were deflected through angles greater than 90˚. What does this observation suggest about the nucleus?
A. It is at the centre of the atom.
B. It is surrounded by orbiting electrons.
C. It is made of protons and neutrons.
D. It is a small region of the atom and is positively charged.
Markscheme
D
Examiners report
[N/A]
Syllabus sections
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