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Unformatted text preview: Homework #4 Answers 1) On a clear (cloudless) night the air temperature is often lower near the ground than it is higher up. Draw a sketch and explain why it is that on such nights you can usually hear sounds from far away. Note also that the earth tends to absorb sound. This is due to refraction in the atmosphere. The sound tends to bend toward the region of lower sound speed. When the temperature is warmer higher up, this is called a temperature inversion. In this case the sound bends down. Sound travels a long way under these conditions because it can go up above all obstacles and then come down. 2) The range of the human voice ranges from about 65 Hz ( a low C ) to about 1046 Hz ( a high C). What wavelengths do these frequencies correspond to (in meters)? Take the speed of sound to be about S=340 m/s. Then, using f S = we can find the wavelengths by dividing S by the frequency....
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- Spring '08