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Question 16 4 pts The primary coil of a transformer has 400 turns and its secondary coil has 100 turns. If the ac voltage applied to the primary coil is 120 V (rms), what ac voltage (rms) is present in its secondary coil? 0 70 V 0 120 V 0 30 V 0 480 V 0 400 VFor an xy=-coordinate system shown in the figure above, the E-vector is in the + direction and the B-vector is in the +x direction. What is the direction of propagation of the electromagnetic wave? B\fQuestion 18 4 pts Which one of the following is the correct ranking of the electromagnetic spectrum from longest to shortest wavelengths? O radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays O radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays O radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays O radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays O radio waves, infrared, X-rays, microwaves, UV, visible, gamma raysThe value of the electric field for a certain electromagnetic wave is 870 N/C. What is the value of the magnetic field for this wave? 0 1.41 x 10 T 0 2.90 x 10-0 T 0 1.90 x 10- T 0 1.10 x 10-6 T 0 2.41 x 106 TQuestion 20 4 pts A polarizer is oriented at an angle 0 = 50 with respect to the vertical. If an unpolarized light wave with intensity 100 W/m passes through the polarizer, what is the intensity of the transmitted light? 0 17 W/m 0 50 W/m- 0 41 W/m 0 94 W/m 0 88 W/mA simple circuit contains a resistor, a charged capacitor, and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the charge O on the capacitor as a function of time t, after the switch is closed? A) Q K D Q B) Q E QIn the figure, a bar magnet moves away from the solenoid. The direction of the induced current through the resistor R is N S R a b from a to b. O O No current is induced. O from b to a. Not enough information is given.Question 23 4 pts What is the surface temperature of a star, if its radiation peak occurs at a wavelength of 200 nm? 0 10,200 K 0 19,000 K O 20,400 K 0 14,500 K 0 17,000 KQuestion 24 What frequency of electromagnetic radiation has photons of energy 4.7 x 10-28 J? (h = 6.626 x 10-34 J . s) 0 41 kHz 0 1.4 GHz 0 710 kHz 0 4.7 MHz 0 710 MHzQuestion 25 4 pts A series R-L-C circuit has a 40-2 resistor, a 0.73-H inductor, a 60-uF capacitor, and an ac source, as shown in the figure. The ac source operates at a frequency of 24 Hz, which is also the resonance frequency fo of the circuit. If the rms current in the circuit is 0.5 A, what is the rms voltage of the ac source? R MAA 600 L C