Reference no: EM132423650

Question 1: Researchers interested in global warming can release sound waves that travel underwater to detection devices located around the planet. Explain how this works in terms of the physics of sound. Some questions to consider: How does this help them determine the temperature of the ocean? What property of waves do they utilize and how does this property change as it travels through different parts of the world's oceans? If the ocean was really warming up how would their observations at the detectors change?

Question 2: Consider a wave travelling in a guitar string tuned to 440 Hz. Describe the phenomena of standing waves, draw and name the first three harmonics, give their frequency, and give the relationships that deal with length and wave length for each.

Question 3: Draw diagrams to show: a) a transverse wave in a string and indicate rest position, amplitude, wavelength, and direction of travel of the wave.

b) the actual particles in a sound wave travelling in an open tube and indicate the wavelength and regions of low density air, normal density air, and high density air. Explain how this can be represented by a sin wave.

Question 4: The sound of a starting pistol can be heard easily from a distance of 800.0 m but the smoke can be seen much sooner than the sound is perceived. Why is the smoke seen before the sound is heard? What is the time delay for the sound of the pistol if the air temperature is 15 °C?

Question 5: A student carefully makes the following observations listening for the resonance points from a tuning fork vibrating above an adjustable length closed air column:

Temperature is 13.3 °C. 1st Resonant Length(s): 8.3 cm

Then they rush their following measurements for additional resonance points to finish the lab: L₂ = 25 cm, L₃ = 58 cm.

(a) Draw diagrams (to show what is happening in the air column) for the first two resonant lengths collected.

(b) Perform the necessary calculations to find the frequency of the unknown tuning fork.

(c) Analyze all the data to see if they made any errors in their collection of observations.

Question 6: A police officer with an exceptionally good ear hears an approaching motorcycle under full throttle making a 660 Hz tone and pulls the motorcycle over to give the driver a ticket. His radar gun lost the speed record but he notices the motorcycles engine at maximum revolution makes a 560 Hz tone.

a) Determine the speed of the motorcycle when the officer first heard it. The air temperature is 10 °C

b) What causes this frequency shift? Indicate with a diagram.

Question 7: An organ pipe open at one end and closed at the other is 30 cm long. If the temperature in the church is 30 °C, what is the fundamental frequency and the first overtone of the pipe?

Question 8: How can the Doppler Effect measure the speed of blood flow in an artery? Assume a small sound source and detector can be placed within the artery.

Question 9: You decide to make a jug and bottle band where you want to play the bottles and jugs by blowing across the tops of the bottles to generate sounds. What is the largest/longest container you will need based on the human range of hearing? Is this a reasonable jug size? Illustrate your explanation with a diagram.