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HW 33 - terry(ect328 homework 33 Turner(59130 This...

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terry (ect328) – homework 33 – Turner – (59130) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider the electromagnetic wave pattern as shown in the figure below. E B What is the direction in which the wave is traveling? 1. from-right-to-left. 2. undetermined, since the figure shows a standing wave. 3. from-left-to-right. correct Explanation: The direction of traveling is the direction of vector E × vector B ; i.e. , from-left-to-right. 002 (part 1 of 3) 10.0 points A plane electromagnetic sinusoidal wave of frequency 10 . 9 MHz travels in free space. The speed of light is 2 . 99792 × 10 8 m / s. Determine the wavelength of the wave. Correct answer: 27 . 5039 m. Explanation: Let : c = 2 . 99792 × 10 8 m / s , and f = 10 . 9 MHz = 1 . 09 × 10 7 Hz . The speed of light is c = λ f λ = c f = 2 . 99792 × 10 8 m / s 1 . 09 × 10 7 Hz = 27 . 5039 m . 003 (part 2 of 3) 10.0 points Find the period of the wave. Correct answer: 9 . 17431 × 10 - 8 s. Explanation: The period T of the wave is the inverse of the frequency: T = 1 f = 1 1 . 09 × 10 7 Hz = 9 . 17431 × 10 - 8 s . 004 (part 3 of 3) 10.0 points At some point and some instant, the electric field has has a value of 600 N / C.
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