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# hw4 - 2.011 HW 4 Due Tuesday In class Problem 1 Review of...

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2.011 HW # 4 Due Tuesday March 21, 2006 In class Problem 1: Review of dB and logarithms: a) Explain in words what a decibel is a measure of. b) Look up (Google, etc.) the relative Source Levels (in dB) for four (4) of the following sounds (cite your source) i. Jet Engine ii. Car iii. Whale (specify type of whale) iv. Underwater seismic activity v. A rock concert at the Fleet center or similar arena vi. A ships propeller (can be any ship, just specify) vii. A dolphin viii. Some other sound c) Expand the following expressions: i. 10 log 10 ( A / B ) = ii. 10 log 10 ( A + B ) = iii. 10 log 10 ( A B ) = d) Given your math in part e and your understanding of the definition for a decibel, calculate the following quantities: i. 10 log 10 (1) dB = ii. 10 log 10 (10) dB = iii. 10 log 10 (0.5) dB = iv. 10 log 10 (4) dB = v. 10 log 10 (16) dB = Problem 2: Sound Wave properties a) A sound wave is really a pressure wave traveling at the speed of _____(?)____. b) Determine the frequency or wavelength of sound waves: i. If frequency, f = 1.0 Hz , then λ = _____m in air and λ = ____m in water.

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hw4 - 2.011 HW 4 Due Tuesday In class Problem 1 Review of...

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