phys quiz 3

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Cosumnes River College *

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360

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Electrical Engineering

Date

Dec 6, 2023

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docx

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1 4 / 4 pts At what angular velocity in rpm will the peak voltage of a generator be 600 V, if its 500-turn, 8.00 cm diameter coil rotates in a 0.300 T field? 7.30 x 10 3 rpm Correct! 7.60 x 10 3 rpm 5.50 x 10 3 rpm 9.30 x 10 3 rpm 2 4 / 4 pts The plug-in transformer for a laptop computer puts out 10.0 V and can supply a maximum current of 2.00 A. What is the maximum input current if the input voltage is 240 V? Assume 100% efficiency. 5.00 A 62.5 mA 48.0 A Correct! 83.3 mA 3 4 / 4 pts A plug-in transformer, supplies 12.0 V to a video game system. How many turns are in its secondary coil, if its input voltage is 120 V and the primary coil has 400 turns? 30.0

50.0 20.0 Correct! 40.0 4 4 / 4 pts The maximum magnetic field strength of an electromagnetic field is 5.00 x 10 -6 Calculate the maximum electric field strength if the wave is traveling in a medium in which the speed of the wave is 0.60c. 550 V/m 1.1 kV/m 2.6 kV/m Correct! 900 V/m 5 4 / 4 pts A green photon has a wavelength of 600 nm. What is its frequency? 4.00 x 10 14 Hz 7.00 x 10 14 Hz Correct! 5.00 x 10 14 Hz

6.00 x 10 14 Hz 6 4 / 4 pts Which of the following lists of radiation is in the order of increasing wavelength? Ultraviolet, X-ray, gamma ray, radio Visible, radio, X-ray, infrared Correct! X-ray, visible, infrared, radio Radio, visible, ultraviolet, gamma ray 7 4 / 4 pts If we look at the electromagnetic spectrum and start on radio waves and move all the way across to gamma rays we find which of the following? Correct! The energy of the waves increases and the frequency also increases. The energy of the waves decreases and the frequency also decreases. The energy of the waves increases but the frequency decreases. The energy of the waves decreases but the frequency increases. 8 4 / 4 pts

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If we look at the electromagnetic spectrum and start on radio waves and move all the way across to gamma rays we find which of the following? The wavelength of the waves increases and the velocity stays constant. The wavelength of the waves increases and the velocity decreases. Correct! The wavelength of the waves decreases and the velocity stays constant. The wavelength of the waves decreases and the velocity also decreases. 9 4 / 4 pts In a simple circuit a battery is connected to a single resistor. If we starting adding resistors in parallel to the first resistor what would happen to the current from the battery? It would decrease. It would stay the same. Correct! It would increase. 10 4 / 4 pts In a simple circuit a battery is connected to a single resistor. If we starting adding resistors in series to the first resistor what would happen to the current from the battery? It would stay the same. It would increase.

Correct! It would decrease.