DP Physics (last assessment 2024)
Question 19N.3.SL.TZ0.b(i)
| Date | November 2019 | Marks available | [Maximum mark: 1] | Reference code | 19N.3.SL.TZ0.b(i) |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 1]
19N.3.SL.TZ0.b(i)
Communication signals are transmitted over long distances through optic fibres.
A signal is transmitted along an optic fibre with attenuation per unit length of 0.40 dB km–1. The signal must be amplified when the power of the signal has fallen to 0.02 % of the input power.
State one cause of attenuation in the optic fibre.
[1]
Markscheme
absorption/scattering of light
OR
impurities in the «glass core of the» fibre ✔
