A sound wave in air has a pressure amplitude equal to 4.00 103 Pa. Calculate the displacement amplitude of the wave at a frequency of 10.0 kHz.

On a particular day the speed of sound in air is 340 m/s. If a plane flies at a speed of 680 m/s, is its Mach number (a) 1.5, (b) 2.0, (c) 2.5, or (d) 2.7?

A cable with a linear density of =0.2 kg/m is hung from telephone poles. The tension in the cable is 500.00 N. The distance between poles is 20 meters. The wind blows across the line, causing the cable resonate. A standing waves pattern is produced that has 4.5 wavelengths between the two poles. The air temperature is T=20C . What are the frequency and wavelength of the hum?

An aircraft flies directly overhead at an altitude of 5 km. If the sound of the aircraft is heard 6 s later, determine the speed and Mach number of the aircraft. Assume an average air temperature of 10°C.

(II) An airplane travels at Mach 2.1 where the speed of sound is 310 m/s (a) What is the angle the shock wave makes with the direction of the airplane’s motion? (b) If the plane is flying at a height of 6500 m, how long after it is directly overhead will a person on the ground hear the shock wave?

A rock is dropped into an abandoned mine and a splash is heard 6 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of the shaft and how fast the rock was falling when it hit the water.

On the planet Venus a rare volcanic eruption occurs. The sound of it is 30 Hz and it has a wavelength of 13.7 m. How fast must the speed of sound be on Venus?

(II) A person, with his ear to the ground, sees a huge stonestrike the concrete pavement. A moment later two soundsare heard from the impact: one travels in the air and theother in the concrete, and they are 0.80 s apart. How faraway did the impact occur? See Table 12–1.

(I) What is the intensity of a sound at the pain level of120 dB? Compare it to that of a whisper at 20 dB.