2012年8月10日 · What is the observed frequency of a 1,200 Hz wave? The observed frequency of a 1,200 Hz wave is 1,200 cycles per second. This means that the wave completes 1,200 oscillations in one second. How is the observed frequency of a 1,200 Hz wave measured? The observed frequency of a 1,200 Hz wave can be measured using a …

2017年4月14日 · A stationary police car emits a sound of frequency 1200 Hz that bounces off a car on the highway and returns with a frequency of 1250 Hz. The police car is right next to the highway, so the moving car is traveling directly toward or away from it. (a) How fast was the moving car going? Was it moving toward or away from the police car? Homework ...

2011年11月8日 · A sound source A and reflecting surface B move directly towards each other. Relative to the air the speed of source A is 29.9 m/s, the speed of the surface B is 65.8 m/s and the speed of sound is 329m/s. The source emits waves …

2003年7月22日 · The trailing vessel has a speed of 64.0 km/h relative to a land based observation point, and the leading ship has a speed of 45.0 km/h relative to the same station. The two ships are in a region of the ocean where the current is moving uniformly due west at 10.0 km/h. The trailing ship transmits a sonar signal at a frequency of 1200 Hz.

2008年2月23日 · A police car speeds toward a warehouse door with its siren emitting sinusoidal waves of frequency fs = 300 Hz, intending to crash through the door. The car moves at 30 m / s and the ambient temperature is 35º C. (a) What is the wavelength of the wave if …

2006年8月5日 · Question: An ambulance with a siren emitting a whine at 1300 Hz overtakes and passes a cyclist pedaling a bike at 2.44 m/s. After being passed, the cyclist hears a frequency of 1280 Hz. Use 343 m/s for the speed of sound in air. How fast is the ambulance moving? i set up the doppler equation with as follows:

2010年1月30日 · [Solved] Two Speakers - Sound Maximum and Sound Minimum Problem Hi, I am having difficulty solving the following problem: Homework Statement Two loudspeakers 5.0 m apart are playing the same frequency. If you stand 13.0 m in front of the plane of the speakers, centered between them, you...

2020年8月2日 · Assuming that the problem is an 80 Hz resonance in your house, it might be possible to change the driving frequency. 80 Hz is 4800 cycles per minute. That sounds like a four blade fan running 1200 RPM. If the fan was changed …

2011年5月5日 · A glass tube with one end open and the other closed is used in a resonance experiment to determine the speed of sound. A tuning fork of frequency 427 Hz is used and resonance is observed for air column lengths equal to 17.4 cm and 55.0 cm. (a) What speed of sound does this experiment give? (b) What is the end correction for this tube?

2014年7月21日 · A manufacturing firm has hired your company, Acoustical Consulting, to help with a problem. Their employees are complaining about the annoying hum from a piece of machinery. Using a frequency meter, you quickly determine that the machine emits a rather loud sound at 1400 Hz. After investigating...