37. Two identical sound producers will sound twice as loud as just one 38. Your

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37. Two identical sound producers will sound twice as loud as just one 38. Your vocal cords used to produce all the sounds you make while speaking 39. Telephones don't transmit frequencies above 3,400 Hz. Musical notes should sound normal over the telephone as long as they are below 3,400 Hz 40. If you increase the linear mass density of rope, the speed of a wave on the rope also increases 41. In the troposphere segment of the Earth's atmosphere, as you increase in altitude the temperature decreases. This means the speed of sound decreases as you increase in altitude 42. For waves moving through the atmosphere at a constant velocity, higher frequency waves must have proportionally longer wavelengths 43. Sound waves propagate in two dimensions

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