Question

In: Physics

2. A whale wants to detect a school of fish by sonar. The school is 20...

2. A whale wants to detect a school of fish by sonar. The school is 20 m wide, and the speed of sound in seawater (density ρ = 1020 kg/m3 ) is 1500 m/s.

a) What is the minimum echolocation frequency that the whale should use to locate the fish?

b) Suppose that the fish are neutrally buoyant thanks to their swim bladders. What fraction of their body volume should be made of air? Assume that the density of the rest of the body (ignoring the swim bladder) is 1060 kg/m3 , and the density of air is 1.3 kg/m3 .

c) A clever fish might try to “acoustically camoflage” itself to sonar by matching its acoustic impedance to that of water. The speed of sound in the fish’s flesh is 1580 m/s. The speed of sound in the air of the swim bladder is 343 m/s. Discuss whether it might be possible to use the swim bladder to adjust the acoustic impedance of the fish to match that of the surrounding water. If this is possible, for what range of frequencies would this trick work?

Solutions

Expert Solution


Related Solutions

A whale uses the equivalent of sonar to locate objects underwater. The whale is swimming away...
A whale uses the equivalent of sonar to locate objects underwater. The whale is swimming away from a stationary shipwreck at the bottom of the ocean at a speed of 6 m/s while emitting a call at 50 Hz. The speed of sound in sea water is 1500 m/s. What frequency does the whale heat reflected from the object underwater?
Product Name Description Fish Finders Helm module using sonar to identify fish Propellers Propulsion unit designed...
Product Name Description Fish Finders Helm module using sonar to identify fish Propellers Propulsion unit designed specifically for V-drives Downriggers Transom mounted deep lake fishing device Panther Marine Corporation Account Name May Balances Four Winns $       7,000.00 Chris Craft $     86,350.00 Sea Ray $     65,000.00 Boston Whaler $     92,500.00 Donzi $   300,000.00 Panther Marine Corporation Chart of Accounts - Accounts Payable Ledger Account Name May Balances Raydar Marine $     25,000.00 Acme $   362,500.00 Scotty $   104,000.00 DU Utility Company $      ...
The dean of the school wants to know the proportion of students in the school who...
The dean of the school wants to know the proportion of students in the school who prefer online classes for the next semester. How do you conduct a research to estimate this proportion by sampling (suppose that you can take only one sample of size n which is smaller than the population size N, and also suppose that a %90 percent confidence interval is fine). - You should explain all steps you take including how you make decision about sample...
Your client Mr. B wants to lose 20 lbs before his high school reuinion next month....
Your client Mr. B wants to lose 20 lbs before his high school reuinion next month. He has decided to eat only meat and other fried foods for the next 4 weeks because he believes a very low carb diet will help him lose weight. How would you respond, considering both the pros and cons of this diet? How would you explain why he needs some carbohydrates? what should be his minimum intake of carbs in grams, and what foods...
The manager of Fish Haven wants a program that displays the number of gallons of water...
The manager of Fish Haven wants a program that displays the number of gallons of water a rectangular aquarium holds, given the aquarium’s length, width, and height measurements in inches. (Hint: There are 231 cubic inches in a gallon.)a.Using the chart shown earlier in Figure 4-12 as a guide, enter the input, processing, and output items, as well as the algorithm, in the first column. b.Desk-check the algorithm twice. For the first desk-check, use 20.5, 10.5, and 12.5 as the...
In a university 20% students belong to the school of business (B), 15% to the school...
In a university 20% students belong to the school of business (B), 15% to the school of engineering(E) and 30% belong to the school of social sciences(S). Of the school of business students 35% have taken a statistics course, of the school of engineering students 45% have taken a statistics course, and of the school of social sciences students, 20% have taken a statistics course. Between the three schools, what fraction of students have taken a statistics course (Q)? If...
A school district wants to see if people's opinions about school closings are related to their...
A school district wants to see if people's opinions about school closings are related to their professions. From a sample of 285 people. The following data was obtained at the alpha= .05 level of significance, test the claim that opinions are independent of profession. Teachers other white collar workers Blue collar workers row totals Favor 14 8 8 30 oppose 105 75 75 255 column totals 119 83 83 285
2. You're a beta fish breeder and have noticed that you have a few fish that...
2. You're a beta fish breeder and have noticed that you have a few fish that display a totally novel ruby red coloring pattern. This ruby red color has since become is very popular in your Etsy store, but you are STRUGGLING to develop a purebreeding strain. Like, every time two ruby red betas are crossed, you end up with a fair number of ruby reds, but still a significant number of betas featuring the standard-type coloration. In your most...
Problem 2: Jonah and the Whale Jonah, Inc. has two operating divisions in a decentralized structure....
Problem 2: Jonah and the Whale Jonah, Inc. has two operating divisions in a decentralized structure. Division X is located in the US and produces the Xwater, which is an input to Division Y’s WhaleY. Division Y is located in the South of France. Division X uses idle capacity to produce Xwater. Xwater has a US domestic market price of $60. Its variable costs are $25 per unit. Jonah’s US tax rate is 40% of income. In addition to the...
2. An elementary school employs 20 teachers; 12 are women and 8 are men. Two teachers...
2. An elementary school employs 20 teachers; 12 are women and 8 are men. Two teachers are selected at random to meet the governor. Is this selection done with or without replacement? a) What is the chance that both are women? b) What is the chance that at least one is a women? c) What is the chance that both are the same gender?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT