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- The highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound in air at this frequency? 2. What is the wavelength of the lowest sounds we can hear, about 20 HzHz?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)1. Calculate the speed of that wave. and compare with the speed of sound in the air. Given wavelength = 4 m resonant frequency = 80.13 Hz
- 10. The sound intensity 5 meters from a point source is 0.5 mW/cm². The power output of the source is: A. 0.125 kW B. 0.39 kW C. 0.79 kW D. 1.6 kW E. 2.6 kW1. A standing wave is created in a musical instrument as shown below. The frequency of the sound is 280 Hz. What is the fundamental frequency of this instrument? а. 70 Hz. b. 40 Hz. XXXX с. 172 Hz. d. 140 Hz. е. 280 Hz.6. A singing barber shop quartet all together makes a sound level intensity of 85 dB when you are standing 7.8 m away on a warm day (27 °C). Assuming each of the 4 singers has equally strong vocals, what power is each singer producing? ANINT The figure below shows two masses hanging 110 g A wave pulse travels the length 8.
- If the wavelength of the standing wave of the vibrating string is 0.6 m, then calculate the length of the string (wire) in metre. а. 1.80 b. 0.20 O c. 0.90 d. 0.40 34°C t pilt A hp.Negative decibels? Our discussion of decibels did not mention that they can be negative. On the Redmond, Washington campus of Microsoft is an anechoic chamber that, according to Guinness World Records, is the quietest place in the world. It measures –20.3 decibels. a. What is the relative intensity of a sound measuring –1 decibels? Round your answer to one decimal place. b. What is the relative intensity of a sound measuring –10 decibels? Round your answer to one decimal place. c. What is the relative intensity of Microsoft's anechoic chamber? Round your answer to three decimal places. d. Is it possible for the relative intensity to actually be zero?27. A water wave travels at a speed of 6 m/s with a wavelength of 200 cm. What is the frequency of this wave? A. 12 Hz B. 0.003 Hz C. 3 Hz D. 0.6 Hz E. 24 Hz