Acoustic transmission between air and water (a) consider an air-water interface for acoustic waves that are normally incident from the air side. what fraction of incident acoustic wave power is transmitted into the water? note that you can compute this by computing the fraction reflected, and the fraction transmitted is what is left over. (b) how about the opposite direction, from water to air? what fraction of normally incident power from the water side is transmitted into the air? (c) using your knowledge of anti-reflection coatings for electromagnetic waves, deter- mine the density, bulk modulus, and thickness of an acoustic anti-reflection coating that could be put on the air-water interface to eliminate reflections from the air side at a frequency of 400 hz. note that there is a range of possible solutions. (d) what kind of material would have these properties? a gas? a liquid? something in between? can you find any real material that comes close? note: if you think that you don't know a parameter that you need to know, then look it up.
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Physics, 21.06.2019 22:30
Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.
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Physics, 22.06.2019 10:10
Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv.a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?
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Physics, 22.06.2019 12:00
Apatient has a history of poor nutrition. he has skin rashes, bleeding gums, and a cut that hasn’t healed in a long time. what vitamin deficiency most likely caused this symptom?
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Physics, 22.06.2019 14:00
Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.
Answers: 1
Acoustic transmission between air and water (a) consider an air-water interface for acoustic waves t...
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