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- The denizens of a distant planet live under an atmosphere made predominately of CO2, which is a dispersive medium. While attending a concert, which of the following would be true for a spectator seated in the back of a large amphitheatre? I. They would hear the low notes and high notes at the same time. II. They would hear the low notes and high notes at different times. III. They would hear nothing because sound can't propagate in CO2.5-4. You pick up an empty 16 oz. plastic coke bottle and blow a steady airstream over the top edge of the bottle's mouth to set the air in the bottle into resonance. What is the frequency of the 1" mode for the bottle? (Hint: you'll need a metric ruler for this question). 5. The Empire State Building in NYC is approximately 440 meters in height. The superstructure of the building is made of steel which means that energy will be transmitted through the buildings core at 1500 m/sec. If the building is being blasted and buffeted by a strong wind storm, at what frequency will the building sway in it's 1st mode of vibration. (Hint: think about what type of a resonator a building could be)
- 4. For a string the wave speed is 80 m/sec. If a new string made of the same material has the same radius and twice the length is used but the tension remains the same, what is the new wave speed? A. 40 m/sec B. 56.6 m/sec C. 80.0 m/sec D. 113 m/sec E. 160 m/secTuning the Waves. You and your team are designing a system that allows you to control the speed of a transverse wave on a thin tungsten wire by adjusting its tension with a spring. One end of the wire is connected to an inner wall of a large wooden crate and the other end to one side of a spring. The opposite side of the spring is then connected to a screw that is mounted on the opposite wall of the crate. The screw can then be adjusted to stretch the spring, and therefore adjust the tension in the wire. The uniform wire is 75.6 cm long and has a mass of 3.15 × 103 kg. The spring has an unstretched length of 11.0 cm and a spring In the lowest possible tension setting of the screw, that is, that which stretches from its equilibrium position. The screw can be turned to stretch it an additional attainable speeds of transverse waves that can travel on the wire with this setup? N/m. constant k = the spring the least, the spring is stretched by 0.500 cm 2.75 cm. What are (a) the highest and…5. On a day when the speed of sound in air is 345 m/s, the fundamental frequency of an open-ended organ pipe is 690 Hz. If the second harmonic of this pipe has the same wavelength as the second overtone (third harmonic) of a closed-end pipe, what is the length of each pipe?