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

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

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:

(bii)

An input signal to the fibre consists of wavelengths that range from 1299 nm to 1301 nm. The diagram shows the variation of intensity with time of the input signal.

Sketch, on the axes, the variation of signal intensity with time after the signal has travelled a long distance along the fibre.

[2]

Markscheme

pulse wider ✔

pulse area smaller ✔

For MP2 do not accept lower amplitude unless pulse area is also smaller.

Examiners report

Most candidates correctly drew a wider pulse with smaller area.

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