AnsKey_HW2

# AnsKey_HW2 - HW#2 FUNDAMENTALS SOUND LEVEL Answer Key 1...

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HW #2 FUNDAMENTALS & SOUND LEVEL Answer Key 1) Speed of Sound, Frequency, and Wavelength λ = f V ……. V = speed of sound, f = frequency, λ = wavelength 2) Sound Intensity & Inverse Square Law 2 4 d W I π = 2 1 2 2 2 1 d d I I = ……. d : distance 3) Sound Intensity Level 0 log 10 I I L I = ……. I = intensity, W/m 2 I 0 = 10 -12 W/m 2 , the threshold of hearing 1. Find the corresponding wavelength of sound at each of the following frequencies. Suppose that the speed of sound in air is 1,000 ft/sec. 1) 20 Hz 2) 250 Hz 3) 1000 Hz By the equation , 1) = = = 20 1000 f V 50 ft 2) = = 250 1000 4 ft 3) = = 1000 1000 1 ft 2. Sound energy requires a medium in which to travel – from one point in the medium to another. The speed of sound is dependent upon density of the medium and other ambient conditions such as temperature and humidity. Discuss how the speeds of sound may be different with each other in air, steel, and in concrete if the ambient conditions are constant. In general, the density of air is a lot lower than the density of steel or concrete, and the density of

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AnsKey_HW2 - HW#2 FUNDAMENTALS SOUND LEVEL Answer Key 1...

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