question 2 page 397 8.5 Questions1. Researchers at the University of Adelaide, Australia,are proposing to control cyanobacteria with ultrasound.Research this topic using Internet resources, and answerthe following questions:(a) What are cyanobacteria, and why are these bacteriaimportant to control?(b) How are cyanobacteria traditionally controlled?(c) Why does the treatment propose using low-frequencyultrasound instead of high-frequency ultrasound?2. An aircraft is flying at Mach 2. What does this mean? IK/U3. An aircraft is travelling at Mach 0.83 in air at 10 °C. Whatis its speed in kilometres per hour? ™ C4. Explain why the speed of sound varies in the differentmaterials in Table 1 on page 395. Kru5. In your own words, define (a) sound intensity, (b) loudness,and (c) decibel. U C6. Why are different units required for sound intensity andloudness? Ku7. In your own words, describe the concept of sound intensity.K/UC8. Research the loudness level that is safe for listening tomusic on, for example, a personal music player.(a) Is there a difference in the level depending on thelength of exposure?(b) Suppose the volume scale of a personal music playerranges from 0 to 10. Suppose also that each levelcorresponds to an increase in volume of 10 dB. Sovolume 1 = 30 dB and volume 3 = 50 dB, and so on.What is the loudest level you should set your personalmusic player to if you listen to music for 2 h a day?9. A busy city street can produce sound levels near 90 dB,depending on the number of large vehicles (Figure 2).Calculate the ratio of the sound intensity of a power saw tothat of a city street. Refer to Table 2 on page 395. Expressyour answer in words. ™ⒸFigure 210. A burglar coughs with an intensity of 2.35 x 10-7 W/m².The burglar alarm is sensitive to an intensity of1.0 x 10-1⁰ W/m² and will ring if the detected sound is30 dB greater than its detection threshold. Will theburglar's cough be detected? ™Ⓒ11. The federal government supports the construction of noisebarriers (also called sound baffles) on the sides of highwaysthat run through residential areas to reduce residentialnoise. Research highway traffic noise barriers.(a) What are the barriers made of?(b) How do they work?(c) How effective are the barriers in reducing residential noise?GO TO NELSON SCIENCE

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Description: question 2 page 397 8.5 Questions1. Researchers at the University of Adelaide, Australia,are proposing to control cyanobacteria with ultrasound.Research this topic using Internet resources, and answerthe following questions:(a) What are cyanobacteria

Aircraft is flying with Mach 2.

Answered: 2. An aircraft is flying at Mach 2.…

Science

Physics

2. An aircraft is flying at Mach 2. What does this mean? K/U

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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