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# Physics Questions **14. Which radiation is used in the treatment of muscle ache?** A. IR B. UV C. Microwaves D. X rays **15. In what situation is it most effective for a microwave to overheat food that has water molecules in it?** A. The microwaves' frequency must be the same as the resonance...

# Physics Questions **14. Which radiation is used in the treatment of muscle ache?** A. IR B. UV C. Microwaves D. X rays **15. In what situation is it most effective for a microwave to overheat food that has water molecules in it?** A. The microwaves' frequency must be the same as the resonance frequencies of the molecules of water. B. The inherent frequency of water molecules has no relation to the frequency of microwaves. C. Because microwaves are heat waves, they always generate heat. D. In a microwave oven, infrared radiation produces heat. **16. Which EM waves are employed in the study of solid structures?** A. X rays B. Microwaves C. Gamma rays D. IR radiation **17. Which technology utilizes the use of the electromagnetic wave's ultra-high frequency band of radio waves?** A. Television B. Commercial FM radio C. Cellular phone D. Commercial AM radio **18. From the diagram below, which two forms of electromagnetic energy mostly pass through the atmosphere to Earth's surface?** Visible light and Radio waves **19. Which EM waves are the MOST harmful and MOST useful to both humans and the environment?** A. Gamma rays and X rays B. X rays and UV radiations C. Gamma rays and Visible light D. Visible light and UV radiations **20. How far away would you view yourself in a plane mirror if you were to stand 52cm in front of it?** A. 15cm B. 30cm C. 104cm D. 120cm **21. Why are high-frequency gamma rays more dangerous to humans than visible light?** Gamma rays have greater energy than visible light for penetrating matter. **22. In the figures below, which circled area is the best depiction of the GREENHOUSE EFFECT?** A. X B. Z C. X and Y D. Z and Y **23. Which explains both the potential dangers of X-rays and their potential to be useful as a diagnostic tool?** B. cancer; imaging internal body parts. **24. What type of image is formed when an object is placed at 1.5 focal lengths from a convex mirror?** A. erect and real B. erect and virtual C. Inverted and real D. inverted and virtual **25. Where is the image located when an object is placed 30 cm from a convex mirror with a focal length of 10 cm?** A. 7.5 cm in back B. 30 cm in back C.15 cm in back D. 37.5 cm in front **26. Which describes an image formed of an object placed at the focus of a concave mirror?** A. real, upright, same size at the focus B. real, inverted, same size at the focus C. real, upright, highly enlarged at Infinity D. real, inverted, highly enlarged at infinity