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Question 19M.3.SL.TZ2.12biii

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.SL.TZ2.12biii
Level SL Paper 3 Time zone TZ2
Command term Explain Question number biii Adapted from N/A
biii.
[Maximum mark: 2]
19M.3.SL.TZ2.12biii

The refractive index n of a material is the ratio of the speed of light in a vacuum c , to the speed of light in the material v or n = c v .

The speed of light in a vacuum c is 2.99792 × 108 m s-1. The following data are available for the refractive indices of the fibre core for two wavelengths of light:

(biii)

Explain the shape of the signal you sketched in (b)(ii).

[2]

Markscheme

reference to dispersion

OR

reference to time/speed/path difference ✔

reference to power loss/energy loss/scattering/attenuation ✔

Examiners report

Correct answers mentioning dispersion and attenuation were common but few candidates were able to relate those phenomena to the shape of the pulse drawn.

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