Physics Waves And Oscillations Level: Misc Level
An open organ pipe that is closed at one end both have lengths of 0.52 m at 20 degrees celcius. What is the fundamental frequency of each pipe.
Physics Waves And Oscillations Level: Misc Level
Bats emit sounds of frequencies around 35.0 kHz and use echolocation to find there prey. If a bat is moving with a speed of 12 m/s toward an insect at an air temperature of 20 degrees celcius, a) What frequency is heard by the insect. b) What frequency is heard by the bat from the reflected sound. c) Would the speed of the bat reflect the answers.
Physics Waves And Oscillations Level: Misc Level
How fast in kilometers per hour, must a sound source be moving toward you to make the observed frequency 5.0% greater then the true frequency.
Physics Waves And Oscillations Level: Misc Level
A person standing 4 m from a wall shouts that the sound strikes the wall with an intesity of 2.5 x 10 -4 W/m squared. Assuming that the wall absorbs 20% of the incident energy and reflects the rest, what is the sound intesity level just before and after the sound is reflected.
Physics Waves And Oscillations Level: Misc Level
Sound propagating through air at 30 degrees Celcius passes through a vertical cold front into air that is 4.0 degrees celcius. If the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in the crossing of the boundry.
Physics Waves And Oscillations Level: Misc Level
Particles approximately 3.0 x 10 -2 cm in diameter are to scrubbed lose from machine parts in a aqueous ulta sonic cleaning bath. Above what frequency should the bath be operated to produce wavelengths of this size or smaller.
Physics Waves And Oscillations Level: Misc Level
If a wave is started up a long rope hanging from the ceiling, it will not climb at constant velocity. Why? Will the wave be traveling faster or slower at the top than the bottom? Is the tension of the rope a factor?
Physics Waves And Oscillations Level: Misc Level
What happens to the period of a simple pendulum if the length is doubled? What happens if the suspended mass is doubled?
Physics Waves And Oscillations Level: Misc Level
A commuter train passes a passenger platform at a constant speed of 40 m/s. The train horn is sounded at 320 Hz. (a) What over all change in freaquency is detected by the person on the platform as the train moves from approaching to receeding? (b)What wavelength is detected by a person on the platform as the train approaches?
Physics Waves And Oscillations Level: Misc Level
A sky rocket explodes 100 m above the ground. Two observers air spaced 200 m apart with observer A being directly under the explosion. What is the ratio of the sound intensity heard by observer A to that heard by observer B? Answer in book =Ia/Ic =5
Physics Waves And Oscillations Level: Misc Level
A noisy machine in a factory produces sound with a level of 80 db. How many indentical machines could you add to the factory with out exceeding the 90 db limit? Answer in book =9 additional machinesA
Physics Waves And Oscillations Level: Misc Level
You are watching a peer being constructed on the far shore of a salt water inlet when some blasting occures. You hear the sound in the water 4.50 seconds before it reaches you through the air. How wide is the inlet? Assume the air temperature is 20 degrees Celcius.Anwer in book =1.99 km
Physics Waves And Oscillations Level: Misc Level
The security alarm on a parked car goes off and produces a frequency of 958 Hz. The speed of sound is 343 m/s. As You drive toward this parked car, pass it, and drive away, you observe the frequency to change by 91 Hz. At what speed are you driving ?
Physics Waves And Oscillations Level: Misc Level
A vibrator moves one end of a rope up and down to generate a wave.The tension in the rope is 56 N. The frequency is then doubled. To what value must the tension be adjusted, so the new wave has the same wavelength as the old one?
Physics Waves And Oscillations Level: Misc Level
A man supports a stone on the flat palm of his hand and then moves his hand vertically with S H M and amplitude of 10 cm. If the man steadily increases the frequency with which he moves his hand, at what frequency will the stone just lose contact with his hand and where in the motion is this most likely to occur?
