7. A bat flies toward a wall at a speed of 5.0 m/s. As it flies, the bat emits an ultrasonic sound wave with frequency 30 kHz. What frequency does the bat hear in the reflected wave?
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- The first overtone of a sound wave in a pipe that is closed at one end has a frequency of 300 Hz. What is the frequency of the second overtone? The general formula for a pipe closed at one end is fn = n(vw/4L)1. A person holds a rifle horizontally and fires at a target. The bullet has a muzzle speed of 180 m/s, and the person hears the bullet strike the target 1.20 s after firing it. The air temperature is 81°F. What is the distance to the target? mA 38.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 38.0-Hz sound wave? What is the ratio of the displacement amplitude to the average distance between molecules in air at room temperature, about 3.00 nm?
- A bungee jumper jumps from rest and screams with a frequency of 403 Hz. The air temperature is 20 °C. What is the frequency heard by the people on the ground below when she has fallen a distance of 14.3 m? Assume that the bungee cord has not yet taken effect, so she is in free-fall. Number Units1. An experiment to measure the speed of sound in an unknown gas uses a hollow cylindrical tube that is 1.050 m long and open at both ends. The tube produces sound of frequency 608.3 Hz when resonating in its first harmonic. What is the speed of sound in the gas?3. H.W: What is the values of the frequency received via a person looking at approaching car at speed of 110 km/h and producing a sound with frequency of 800 Hz? Assume that the speed of sound is 345 m/s. Then, what is the values of the frequency does the same person hear when the car move away? (878 Hz; 735 Hz).
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