DP Physics (last assessment 2024)

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

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

biv.

[Maximum mark: 2]

19M.3.SL.TZ2.12biv

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 $n = \frac{c}{v}$ .

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:

(biv)

A signal consists of a series of pulses. Outline how the length of the fibre optic cable limits the time between transmission of pulses in a practical system.

[2]

Markscheme

longer cables give wider pulses ✔

which overlap/interfere if T too small/f too high ✔

OWTTE

Examiners report

Most candidates did not mention the fact that if the time between pulses was too small then the pulses would overlap for longer fibres.

Syllabus sections

Option C: Imaging

Option C: Imaging » Option C: Imaging (Core topics) » C.3 – Fibre optics

Option C: Imaging » Option C: Imaging (Core topics)

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

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