Leader: Wesley Worksheet #28 Sound Waves Course: PHYS 221 Supplemental Instruction Instructor: Whisnant 04/09/2014 Date: (Energy in Mechanical Waves) A piano wire with mass and length is stretched with a m L tension of A wave with frequency and amplitude travels along the wire. F. f A What is the average power carried by the wave? What is the average power when the amplitude of the wave is only half of what it was before? = 3.00 g m = 80.0 cm L 25.0 N F = = 120.0 Hz f = 1.6 mm A (Sound Waves) A loud factory machine produces sound having a displacement amplitude of but the frequency of this sound can be adjusted. In order to prevent damage to the A, workers, the maximum pressure amplitude of the sound waves is limited to Under the P. conditions of this factory, the bulk modulus of air is What is the highest frequency B. sound to which this machine can be adjusted without exceeding the prescribed limit? Is the frequency audible to the workers? = A 1.00 μm 10.0 Pa P = = 1.42*105 Pa B
Worksheet #28 Sound Waves Supplemental Instruction Leader: Wesley Course: PHYS 221 Instructor: Whisnant Date: 04/09/2014 (Energy in Mechanical Waves) A piano wire with mass m and length L is stretched with a tension of F. A wave with frequency f and amplitude A travels along the wire. What is the average power carried by the wave? What is the average power when the amplitude of the wave is only half of what it was before? m = 3.00 g L = 80.0 cm F = 25.0 N f = 120.0 Hz A = 1.6 mm (Sound Waves) A loud factory machine produces sound having a displacement amplitude of A, but the frequency of this sound can be adjusted. In order to prevent damage to the workers, the maximum pressure amplitude of the sound waves is limited to P. Under the conditions of this factory, the bulk modulus of air is B. What is the highest frequency sound to which this machine can be adjusted without exceeding the prescribed limit? Is the frequency audible to the workers? A = 1.00 μm P = 10.0 Pa B = 1.42*105 Pa
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