A skydiver carries a buzzer emitting a steady tone at 800 Hz. A friend on the ground at the landing site directly below listens to the amplified sound he receives. Assume that the air is calm and that the sound speed is 343 m/s, independent of altitude. While the skydiver is falling at terminal speed, her friend on the ground receives waves of frequency 1125 Hz. a. What is the skydiver's speed of decent? b. Suppose the skydiver can hear the sound of the buzzer reflected from the ground. What frequency does she receive? c. What beat frequency would the skydiver hear?

a. Students in a physics lab are asked to find the length of an air column in a tube closed at one end that has a fundamental frequency of 230 Hz. They hold the tube vertically and fill it with water to the top, then lower the water while a 230 Hz tuning fork is rung and listen for the first resonance. What is the air temperature (in °C) if the resonance occurs for a length of 0.380 m? b. At what length (in m) will they observe the second resonance (first overtone)?

30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?

An Ethernet cable is 4.30 m long. The cable has a mass of 0.195 kg. A transverse pulse is produced by plucking one end of the taut cable. The pulse makes four trips down and back along the cable in 0.840 s. What is the tension in the cable? N Need Help? Read It Watch It

The speed of sound in air is 330 m s-¹ 1. A motorcyclist travelling at a speed of 29 m s-¹ sounds the horn on their motorbike while passing a pedestrian beside the road. The rider hears the horn as a sound of frequency 250 Hz. a. What frequency does the pedestrian hear: i. when the motorcycle approaches? ii. when the motorcycle moves away? b. Explain why, when the motorcycle is right in front, the pedestrian hears the same frequency as the rider. D

The Wanamaker Pipe Organ in Macy's Center City department store in Philadelphia is the largest working pipe organ in the world. The organ occupies a seven- story hall, and has the longest pipe length of 9.75 m that occupies four floors and can be used as either an open or a closed pipe. Assume that the speed of sound is 345 m/s. a. Calculate the lowest fundamental frequency for the Wanamaker Pipe Organ. b. The highest note on an 88-key piano is 4186 Hz. What would be the length of a pipe open on one end that produced this as a fundamental frequency?

An ethernet cable is 3.90 m long and has a mass of 0.210 kg. A transverse pulse is produced by plucking one end of the taut cable. The pulse makes four trips down and back along the cable in 0.810 s. What is the tension in the cable?N

a. What is the fundamental frequency of a 0.533-m-long tube, open at both ends, on a day when the speed of sound is 344 m/s? f1 Hz b. What is the frequency of its second harmonic? f2 = Hz

A train approaches a station and sounds it’s horn which has a natural frequency of 155 Hz. The train is traveling at 39 m/s and the speed of sound in air is 340 m/s. A. What frequency does a person standing at the station hear? B. What frequency does a person sitting on a train hear?

A.) I have an open-closed tube with a length of 0.7 m and a radius of 0.5 cm. What is the wavelength of mode number 2, in m? B.) I have an open-open tube with a length of 0.7 m and a radius of 1.6 cm. What is the frequency of mode number 1, in Hz? The speed of sound is 343 m/