Giáo trình anh văn chuyên ngành cơ khí phần 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Giáo trình anh văn chuyên ngành cơ khí phần 2
Giáo trình anh văn chuyên ngành cơ khí phần 2
Unit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................ Giáo trình anh văn chuyên ngành cơ khí phần 2 .....................78..........................Task 2. Work in groups.What are lasers?List any applications or devices you know about lasers.Task 3. Read this text to check your answers to Task 1.Lasers (Light Amplification by Stimulated Emission of Radiation) are the devices which amplify light a Giáo trình anh văn chuyên ngành cơ khí phần 2 nd produce beams of light which are very intense, directional, and pure in colour. They can be in solid state, gas, semiconductor, or liquid.5 When laGiáo trình anh văn chuyên ngành cơ khí phần 2
sers were invented in 1960, some people thought they could be used as “death rays”. In the 1980s, the United States experimented with lasers as a defeUnit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................ Giáo trình anh văn chuyên ngành cơ khí phần 2 ommunications, 10 medicine, and the arts.In engineering, powerful laser beams can be focused on a small area. These beams can heat, melt, or vaporize material in a very precise way. They can be used for drilling diamonds, cutting complex shapes in materials from plastics to steel, for spot welding a Giáo trình anh văn chuyên ngành cơ khí phần 2 nd for surfacing15 techniques, such as hardening aircraft engine or turbine blades. Laser beams can also be used to measure and align structures.LaserGiáo trình anh văn chuyên ngành cơ khí phần 2
s are ideal for communications in space. Laser light can carry many more information channels than microwaves because of its 20 high frequency. In addUnit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................ Giáo trình anh văn chuyên ngành cơ khí phần 2 ead by lasers.In medicine, laser beams can treat damaged tissue in a fraction of a second without harming healthy tissue. They can be used in very 25 precise eye operations.In the arts, lasers can provide fantastic displays of light. Pop concerts are often accompanied by laser displays.1.Matching ea Giáo trình anh văn chuyên ngành cơ khí phần 2 ch paragraph with the heading.i.use of laser in communicationsii.a brief view of laseriii.lasers in the artsiv.the role of lasers in medicineV. applicGiáo trình anh văn chuyên ngành cơ khí phần 2
ations of lasers in engineering2.Complete the following table with ONE word only.ApplicationsHow lasers workuses•targetsEngineering•melt ormaterials •Unit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................ Giáo trình anh văn chuyên ngành cơ khí phần 2 ignal strength •and read information• treat damaged tissue such as eye.Arts• provide fantasticof light such as pop concertsTask 4. Study the diagram and the words given. Point out the main differences between an ordinary light beam and a laser beam.laser ordinary light organized disorganized directi Giáo trình anh văn chuyên ngành cơ khí phần 2 onal indirectional in one didrection in many directions concentrate photon monochrome polychrome single wavelengthvarious wavelength__________________Giáo trình anh văn chuyên ngành cơ khí phần 2
________________________________Unit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................Unit 7 LASERSTask 1. Warm-upWhat does LASER stand for?Figure out different applications of lasers.2......................1............................Gọi ngay
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