| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.36 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 36 | Adapted from | N/A |
Question
Evidence for nuclear energy levels comes from discrete energies of
I. alpha particles
II. beta particles
III. gamma ray photons.
Which of the above statements is/are true?
A. I and II only
B. I and III only
C. II only
D. III only
Markscheme
B
Examiners report
The continuous spectrum for beta emission is the key here. A continuous spectrum is not characteristic of discrete energy levels (but alpha and gamma occur with distinct energies and therefore must be related to nuclear energy levels).
Syllabus sections
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