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# 18 - fryer(vdf96 Waves graves(6 This print-out should have...

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fryer (vdf96) – Waves – graves – (6) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 10.0 points The string of a cello playing the note “C” oscillates at 264 Hz. What is the period of the string’s oscilla- tion? Correct answer: 0 . 00378788 s. Explanation: Let : f = 264 1 / s . T = 1 f = 1 264 1 / s = 0 . 00378788 s . 002 10.0 points Microwaves travel at the speed of light, 3 . 00 × 10 8 m/s. When the frequency of microwaves is 9 . 90 × 10 9 Hz, what is their wavelength? Correct answer: 0 . 030303 m. Explanation: Let : v = 3 . 00 × 10 8 m / s and f = 9 . 9 × 10 9 Hz . λ = v f = 3 × 10 8 m / s 9 . 9 × 10 9 Hz = 0 . 030303 m . 003 10.0 points The distance between two successive crests of a certain transverse wave is 1 . 29 m. Eight crests pass a given point along the direction of travel every 13 . 2 s. Calculate the wave speed. Correct answer: 0 . 781818 m / s. Explanation: Let : λ = 1 . 29 m , n = 8 crests , and Δ t = 13 . 2 s . v = f λ = n Δ t λ = 8 13 . 2 s (1 . 29 m) = 0 . 781818 m / s . keywords: 004 10.0 points A harmonic wave is traveling along a rope. It is observed that the oscillator that generates the wave completes 40 . 2 vibrations in 34 . 4 s. Also, a given maximum travels 434 cm along the rope in 10 . 7 s. What is the wavelength? Correct answer: 34 . 7087 cm. Explanation: Let : n = 40 . 2 vibrations , t 1 = 34 . 4 s , Δ x = 434 cm , and t 2 = 10 . 7 s . The speed of the wave is

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18 - fryer(vdf96 Waves graves(6 This print-out should have...

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