A scientist exposes two identical samples of body tissue to microwaves of the same frequency and intensity. All other conditions are kept the same, so only the exposure time is changed. One sample is exposed for 20 s and the other sample is exposed for 80 s.
Explain why the sample exposed for 80 s is more likely to be harmed.
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.