If a string fixed at both ends resonates in its fundamental mode with a frequenc

Question

If a string fixed at both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate? Problem 22 75 Hz B) 300 Hz C) 450 Hz D) 600 Hz E) 750 Consider a pipe of length L that is open at both ends. What are the wavelengths of the three lowest-pitch tones produced by this pipe? Problem 23 A) 4L, 21, 21, L, 213 4L, 4L/3. 41/5 Problem 24 Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are sep- arated by a distanee of 8.oo m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s person moves 3.00 m parallel to the wall, she experiences destructive interference 278 B) 422 Hz C) 452 D) 562 E)694 Problem 25: Consider two pipes of the same length: one ipe is open at both ends and the other pipe is closed on one end but open at the other end. If the fundamental frequency of the totally open pipe is 300 Hz, what is the fundamental frequency of the otherpipe? A) 150 Hz B) 300 Hz C) 450Hz D) 600 None of these. Problem 26: Monochromatic coherent light shines through a pair of slits. If the wavelength of the light is decreased which of the following statements are true of the resulting interference pattern? A) The distance between the maxima stays the same The distance between the maxima increases C) The distance between the minima stays the same D) The distance between the minima increases E) The distance between the minima decreases

Explanation / Answer

22 A lower than fundamental frequency not possible  

23 2L,L,2L/3   

24 278 hz  
25 150 Hz  

26 the distance between minima decreases
25

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