page 14 18. A ray of monochromatic light travels from a crown glass block into water. The diagram shows three paths P, Q, and R for the ray of light in the water. ray of light crown glass water P Q R Which row in the table shows what happens to the speed and the wavelength, and the path the ray of light follows in the water? Speed Wavelength Path A decreases decreases R B decreases decreases P C stays the same stays the same Q D increases increases R E increases increases P 19. An AC power supply of negligible internal resistance is connected to an 8.0 Ω resistor. The rms voltage of the power supply is 5.0 V. The peak power dissipated in the 8.0 Ω resistor is A 0.44 W B 0.63 W C 1.4 W D 3.1 W E 6.3 W.