| Date | November 2010 | Marks available | 2 | Reference code | 10N.3.SL.TZ0.G1 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 0 |
| Command term | State | Question number | G1 | Adapted from | N/A |
Question
This question is about lasers.
With reference to the light waves emitted by a laser, state what is meant by the terms
(i) monochromatic.
(ii) coherent.
Markscheme
(i) (the waves) all have the same frequency/wavelength;
Do not accept “one colour”.
(ii) (the waves) are all in phase with each other / the phase difference between the waves is constant;
Examiners report
Most candidates knew what was meant by the terms monochromatic and coherent.
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