Assign14 - PHY 53 Summer 2010 Assignment 14 1. A harmonic...

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Assignment 14 1. A harmonic wave in a string is described by y ( x , t ) = 0.01cos(0.6 x 60 t ) . [SI units.] a. What is the wavelength λ ? b. What is the frequency f ? c. What is the speed v of the wave? d. What is the power transmitted past a point on the string, if the mass per unit length of the string is 1 g/m? {See Waves 1, page 6.] Ans : 18 mW. 2. Some questions about transmission and reFection of waves. a. A string consists of two pieces, attached as shown. It is stretched so the tension is T in both parts. A wave is sent down part A toward the interface, with power P 0 . The masses per unit length obey μ B = 4 A . Is the reFected wave inverted? b. What is the power reFected at the interface? [See Waves 1, page 7.] Ans : P 0 /9 . c. Explain why a sound wave reFected from a massive wall is not inverted, while a wave in a string attached to the wall is inverted. 3. Some questions about loudness and the db scale. a. An increase in loudness of 1 db represents what percent increase in intensity? b.
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Assign14 - PHY 53 Summer 2010 Assignment 14 1. A harmonic...

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