14. 15. 16. 17. 18. There is a potential difference between a pair of parallel plates, and plate A is positive and plate B is negative. A positive test charge is placed between the two plates. The plate with the higher electric potential is: (K) plate A plate B plates A and B have the same potential the plate that is closer to the positive charge it depends on the mass of the test charge seeps Which of the following statements about eld lines is true? (K) a. Field lines are always perpendicular to the surface of the object creating the field. b. Field lines always point in the direction of the motion of the object creating the field. c. Field lines never cross. d. Field lines are always straight. e. Field lines represent a force that remains uniform along the entire length of the field line. A series of wave fronts in a wave tank travel toward an opening in a barrier. To increase the amount of visible diffraction, one could: (K) increase the wave's amplitude decrease the wave's frequency increase the width of the opening in the barrier decrease the distance between the source of the waves and the barrier use a shorter wavelength seeps When two wave sources are in-phase, and the wave from one source has to travel one-half wavelength further from the wave from the other source, there will be (K) destructive interference constructive interference alternating constructive and destructive interference simultaneous constructive nor destructive interference no interaction seeps Proof that light is a transverse wave lays in the fact that it: (K) can diffract slows down and bends toward the normal when it travels through a denser medium travels through space, a vacuum can be polarized can disperse when shone through a glass prism at the right angle peeve 19. USCA ACADEMY 5PH4U FINAL EXAM You and your friend are in spaceships becoming increasingly far away from one another as you shine beams of light toward one another. The spaceships are getting further apart at a rate of 0.5 c and no one is accelerating. As a result of this motion, (K) a. you will see her light reaching you at a rate of 0.75 c and she will see your light approaching her at a rate of 0.75 c b. you will see her light reaching you at a rate of 0.5 c and she will see your light approaching her at a rate of 0.5 c c. what your measure for the speed of light depends on is who is really moving and who is actually at rest, and only the person truly at rest will measure light properly d. the effects of time dilation and length contraction will make the speed of light impossible to measure properly for both of you (there will be no relation between your measurements) e. you will both measure the speed of light coming from the other spaceship to be c