Homework 1 Solution

Homework 1 Solution - Version PREVIEW – Homework 1 –...

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Unformatted text preview: Version PREVIEW – Homework 1 – Savrasov – (39825) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Harmonic Wave 001 10.0 points A harmonic wave travels in a wire with am- plitude 6 . 27 mm, wavelength 1 . 49 m, and fre- quency 462 Hz. What is the speed with which the wave travels? Correct answer: 688 . 38 m / s. Explanation: Let : λ = 1 . 49 m and f = 462 Hz . The speed of a traveling wave is v = λ f = (1 . 49 m) (462 Hz) = 688 . 38 m / s . Holt SF 12D 03 002 10.0 points The red light emitted by a He-Ne laser has a wavelength of 633 nm in air and travels at 3 . 00 × 10 8 m/s. Find the frequency of the laser light. Correct answer: 4 . 73934 × 10 14 Hz. Explanation: Let : λ = 633 nm and v = 3 × 10 8 m / s . The speed of light is given by v = f λ f = v λ = 3 × 10 8 m / s 633 nm · 10 9 nm 1 m = 4 . 73934 × 10 14 Hz . Serway CP 13 49 003 (part 1 of 2) 10.0 points Tension is maintained in a string as in the figure. The observed wave speed is 23 m / s when the suspended mass is 3 . 4 kg . 3 . 4 kg What is the mass per unit length of the string? The acceleration of gravity is 9 . 8 m / s 2 . Correct answer: 0 . 0629868 kg / m. Explanation: Let : v = 23 m / s , m = 3 . 4 kg , and g = 9 . 8 m / s 2 . The tension in the string is F = m g and its velocity is v = radicalBigg F μ , and μ = F v 2 = m g v 2 = (3 . 4 kg) ( 9 . 8 m / s 2 ) (23 m / s) 2 = . 0629868 kg / m . 004 (part 2 of 2) 10.0 points What is the wave speed when the suspended mass is 1 . 6 kg?...
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This note was uploaded on 02/25/2010 for the course PHY 15166 taught by Professor Mr.donald during the Spring '10 term at 4.1.

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Homework 1 Solution - Version PREVIEW – Homework 1 –...

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