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17. Electromagnetic waves A. are transverse B. C . are produced by vibrating charges D . do not require a physical medium for wave propagation travel at 3x108 m/s E . all of the above 18. All waves exhibit the following behaviors: A. interference B. refraction C . doppler effect D . diffraction E. all of the above 19. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called A. longitudinal waves B. transverse waves C. surface waves D. none of the above 20. The energy of a wave is related to the wave's A. period B. wavelength C. speed D. amplitude E. none of the above 21. A person weight 800 N. What is the person's mass? B. 85.1 kg C. 86.9 kg D. 84.2 kg E. none of the above A. 18.2 kg 22. When a sound wave travels from one place to another, what is transported? C. energy D. nothing A. air B. density 23. An unknown object with a weight of 200 N is placed in water. The object will A. sink B. float - partially submerged C. float - completely submerged D. cannot determine E. none of the above