2. A bat hunting for food sends out a 50-khz \'\'sound\'\' pulse. What Is roughl
ID: 1318590 • Letter: 2
Question
2. A bat hunting for food sends out a 50-khz ''sound'' pulse. What Is roughly the smallest flying insect that can be detected by the bat? (Hint-resolution idea; i.e., resolution is on the order of the wavelength .) Assume an air temperature of 25-degrees Celsius. . ( 40) 3. Two identical motor bikes are racing towards each other, each at 40 m/sec. Each bike has a horn that is sounding a very low frequency signal of 22 hertz. What does each biker hear upon approach? What does each biker hear after they have passed each other (receding)? Explain and discuss. Assume the speed of sound in air is 350 m/s. In what season did this event probably take place if it was in Toledo? Explain. .Explanation / Answer
1.
wavelength = velocity / frequency
velocity = speed of sound at 25 degrees C = 346.287 m/s
frequency = 50,000 Hz
Therefore,
wavelength = 346.287 / 50000 = 0.00692574
2.
as they approach, the pitch gets higher until they reach each other then after they pass the pitch gets lower and lower as they continue apart.
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