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solution_pdf33 - tovar(jdt436 homework 33 Turner(59070 This...

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tovar (jdt436) – homework 33 – Turner – (59070) 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. B E What is the direction in which the wave is traveling? 1. from-left-to-right. 2. undetermined, since the figure shows a standing wave. 3. from-right-to-left. correct Explanation: The direction of traveling is the direction of vector E × vector B ; i.e. , from-right-to-left. 002 (part 1 of 3) 10.0 points A plane electromagnetic sinusoidal wave of frequency 14 . 6 MHz travels in free space. The speed of light is 2 . 99792 × 10 8 m / s. Determine the wavelength of the wave. Correct answer: 20 . 5337 m. Explanation: Let : c = 2 . 99792 × 10 8 m / s , and f = 14 . 6 MHz = 1 . 46 × 10 7 Hz . The speed of light is c = λ f λ = c f = 2 . 99792 × 10 8 m / s 1 . 46 × 10 7 Hz = 20 . 5337 m . 003 (part 2 of 3) 10.0 points Find the period of the wave. Correct answer: 6 . 84932 × 10 - 8 s. Explanation: The period T of the wave is the inverse of the frequency: T = 1 f = 1 1 . 46 × 10 7 Hz = 6 . 84932 × 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 538 N / C.
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