# PHY ch. 28 - 28.1 #8 A microphone is located on the line...

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Unformatted text preview: 28.1 #8 A microphone is located on the line connecting two speakers that are 0.750 m apart and oscillating 180 out of phase. The microphone is 2.00 m from the midpoint of the two speakers. What are the lowest two frequencies that produce an interference maximum at the microphones location? Ans: 229 and 6__? d = lowest-f 0.75 = lowest-f lowest-f = 1.50 m v = f lowest lowest-f 345 = f lowest-f 1.5 f lowest = 230 Hz d = 2nd lowest-f 3/2 0.75 = 2nd lowest-f 3/2 2nd lowest-f = 0.5 m v = f lowest 2nd lowest-f 345 = f 2nd lowest-f 0.5 f 2nd lowest = 690 Hz 28.3 #32 (a) What is the minimum soap-film thickness (n = 1.33) in air that will produce constructive interference in reflection for red (...
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## This note was uploaded on 09/03/2008 for the course PHYS 104 taught by Professor Dr.g during the Spring '08 term at Gwinnett Technical College.

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PHY ch. 28 - 28.1 #8 A microphone is located on the line...

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