Text-based exercisesExercise III. Give English equivalents for the following words and word combinations:
Exercise IV. Match the terms with the following definitions. Choose from plastics, beam, gas, diamond, steel: 1. Alloy of iron and about 2% or less carbon is called ……….. 2. Mineral composed of pure carbon, the hardest naturally occurring substance known and a valuable gemstone is called …………….. 3. That portion of the electromagnetic spectrum visible to the human eye is called …………… 4. Polymers that can be molded or shaped, usually by heat and pressure are called …………… 5. A line of light, electric waves or particles is called ………...
Exercise V. Answer the following questions to check your understanding of the text:
1. What is a laser? …………………………………………………………………..…………………............. 2. When were lasers invented? …………………………………………………………………..…………………............. 3. Where can people use lasers? …………………………………………………………………..…………………............. 4. Can laser beams be used for drilling diamonds and cutting complex shapes in materials from plastics to steel? …………………………………………………………………..…………………............. 5. Where can lasers provide fantastic displays of light? …………………………………………………………………..………………….............
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