40. Ohm established in the late 1820's that if a voltage was ap- plied to a resistance then \"current would flow and then power would be consumed\". a. True b. False 41. Lightning is an example of static Electricity a. True b. False 42. Sound moves most quickly through solids, because its molecules are densely packed together. a. True b. False 43. Which of the following is not a type of sound waves? a. Longitudinal Sound Waves b. Mechanical Sound Waves c. Pressure Sound Waves d. Temperature Sound Waves 44. Artificial Magnet are man made a. True b. False 45. The earth behave as if there is a huge magnet in it. a. True b. False 46. All magnets have two poles. This is North pole and South poles a. True b. False 47. lfyou cut a bar magnets in half. You get two brand new smaller magnetsI each with its own north and south pole. a. True b. False 48. Dynamics refers to a sound's degree of loudness or soft- ness and is related to the amplitude of the vibration that pro- duces the sound. a. True b. False 49. When an object vibrates, it causes the surrounding air mol- ecules to vibrate' initiating a chain reaction of sound wave vi- brations throughout the medium a. True b. False 50. Which of the following is not a characteristics of sound waves? a. Amplitude b. Frequency c. Wavelength d. Color e. Time Period 51. What is the logarithmic ratio of the sound pressure com- pared to a reference pressure? a. Hertz b. Decibels c. Sone d. Wavelength 52. The phon refers to perceived loudness, while the sone is the subjective loudness. a. True b. False 53. Sound waves can be described by graphing either dis- placement or density. a. True b. False 54. Hertz and decibels are widely used to describe and meas- ure sounds, but phon and sone are also used. a. True b. False 55. Because sound waves consist of compressions and rare- factions, their regions do not fluctuate between low and high- pressure patterns. a. True b. False 56. Transverse waves move with oscillations that are perpen- dicular to the direction of the wave. a. True b. False 57. What is the decibels for normal conversation? a. 35-40 b. 50-60 c.1 20-140 d.150-190 58. A branch of physics that deals with the determination of behavior and the properties of light, along with its interactions with the matter and also with the instruments which are used to detect it. a. Illuminance b. Incandescente c. Optics d. Candela 59. The study of light in the area of physics a. Illuminance b. Incandescente c. Optics d. Candela 60. Light is a form of energy that is in the form of an electro- magnetic wave and is almost everywhere around us. a. True b. False