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Course: PHYS 214, Spring 2008
School: Cornell
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Word Count: 118

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2214 Physics Assignment 6 Brief Answers 1. (a) Z2 /Z1 very small or very large. (b) Z2 /Z1 &lt; 1. (c) Z2 /Z1 &gt; 1. (d) Z2 /Z1 very large. (e) v2 /v1 &lt; 1. 2. (a) 2 /1 very small. (b) F2 /F1 = 2 /1 . For T = 2, 0. (c) K2 /K1 = 2 /1 . For T = 2, 0. 3. (b) Z1 (1 R) = Z2 T (c) T = 2Z1 /(Z1 + Z2 ), R = (Z1 Z2 )/(Z1 + Z2 ). 4. (a) vair = 344 m/s, Zair = 413 kg/m2 /s. vwater = 1483 m/s, Zwater = 1.48...

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2214 Physics Assignment 6 Brief Answers 1. (a) Z2 /Z1 very small or very large. (b) Z2 /Z1 < 1. (c) Z2 /Z1 > 1. (d) Z2 /Z1 very large. (e) v2 /v1 < 1. 2. (a) 2 /1 very small. (b) F2 /F1 = 2 /1 . For T = 2, 0. (c) K2 /K1 = 2 /1 . For T = 2, 0. 3. (b) Z1 (1 R) = Z2 T (c) T = 2Z1 /(Z1 + Z2 ), R = (Z1 Z2 )/(Z1 + Z2 ). 4. (a) vair = 344 m/s, Zair = 413 kg/m2 /s. vwater = 1483 m/s, Zwater = 1.48 106 kg/m2 /s. (b) T = 5.58 104 (c) . R = 0.2, T = 0.8. (d) R = 0.14, T = 1.14. 5. (a) 2 = 9.99 g/m, L2 = 7.91 cm. (b) There will be a reected wave. 6. (a) uk (J/m) 0.040 0.032 0.024 0.016 0.008 0 1 2 3 4 5 6 7 8 x (m) 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 1 (b) up (J/m) 0.040 0.032 0.024 0.016 0.008 0 1 2 3 4 5 6 7 8 x (m) 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 (c) Energy at both times is 0.128 J. 7. (a) A = 36.9 cm. (b) A = 7.38 m. 2
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