1) Which effect is shown here? a) Refraction b) Reflection c) Dispersion d) Diffraction 2) What would happen if the gap became wider? a) Waves speed up b) More diffraction c) Nothing d) Less diffraction 3) Which of these types of wave has the longest wavelength? a) Visible light b) Microwaves c) Ultraviolet d) Infrared 4) Which of these is most likely to cause a longitudinal wave? a) An electric heater b) An explosion c) Dropping a stone in a lake d) A torch 5) What is missing here? a) Amplitude b) Energy c) Wavelength d) Hertz 6) Which of these travels LEAST easily through the atmosphere? a) Radio waves b) Ultraviolet c) Visible light d) Microwaves 7) Which of these is generally most dangerous to human health? a) Microwaves b) Visible light c) Radio waves d) Gamma rays 8) What type of radiation is being used here? a) Visible light b) Microwave c) Ultraviolet d) Infrared

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