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18. A student has three resistors and trying to design a circuit that will maximize the amount of current going through it. Which of the
18. A student has three resistors and trying to design a circuit that will maximize the amount of current going through it. Which of the following circuit diagrams should he choose for his set up? a. RI RZ R3 b Rz R3 Vsource C. R 2 R3 d. none of the above 19. If light moves from left to right along the x-axis, then the electric field line vibrates along a. the y-axis and the magnetic field line vibrates along the z-axis b. the x-axis and the magnetic field vibrates along the y-axis c. the y-axis and the magnetic field vibrates along the x-axis d. the x-axis and the magnetic field also vibrates along the x-axis 20. Which of the following accurately describes the Doppler effect? a. As an object emitting a sound approaches an observer, the sound waves expand, so that the observer hears a higher frequency. b. As an object emitting a sound approaches an observer, the sound waves expand, which reduces their energy and dampens the noise. c. As an object emitting a sound approaches an observer, the sound waves become compressed, so that the observer hears a lower frequency. d. As an object emitting a sound approaches an observer, the sound waves become compressed, so that the observer hears a higher frequency. 6
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