An ultraviolet lamp sterilises equipment in a hospital laboratory. A technician working near the lamp without protection would start to suffer skin damage after 16 minutes.
A protective screen is placed between the lamp and the technician. The screen increases the time before skin damage starts by a factor of 20.
The lamp is on, with the technician working behind the screen, from 08:45 until 14:15.
Determine whether the technician's skin could start to be damaged before the lamp is switched off.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.