Chapter 24: Modern Optics and Matter Waves 24-5 3. Sound of frequency f is broadcast into the enclosed tube, shown in the diagram, that is filled...

Chapter 24: Modern Optics and Matter Waves 24-5 3. Sound of frequency f is broadcast into the enclosed tube, shown in the diagram, that is filled with roomtemperature (20C) air. The upper section, of length L , can be extended like a trombone slide. A microphone at L the far end of the tube detects maxima of the sound intensity when L is 24 cm, 32 cm, and 40 cm, and at no positions in between these. a. What is the sound frequency? 10 cm b. The slide is returned to the position L = 24 cm. Then the frequency of the sound is slowly decreased.