A food producer compares ultraviolet and gamma radiation. The packaging stops ultraviolet but allows enough gamma radiation through to kill microorganisms inside. The food must remain sealed during treatment. Which choice and explanation are correct?
Gamma is suitable; it reaches the microorganisms but cannot damage workers' cells.
Gamma is suitable; it reaches the microorganisms but can also damage workers' cells.
Ultraviolet is suitable; it damages the packaging and so kills the microorganisms inside.
Ultraviolet is suitable; it damages the packaging without affecting the microorganisms inside.
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.