Inversion in conditional sentences
Module 10
Lesson 3
HOW LASER WORKS
In each line find the one odd out
| 1. | employ | use | apply | |
| 2. | expand | amplify | trigger | increase |
| 3. | refine | award | improve | upgrade |
| 4. | machine | process | construct | treat |
| 5. | propose | suggest | offer | employ |
| 6. | simulate | trigger | activate | stimulate |
| 7. | design | make | build | construct |
| 8. | conventional | groundbreaking | revolutionary | innovative |
LASER PROPERTIES
LISTENING
Listen and choose the correct laser property in each column
| 1 · monochromatic · monodramatic · monogramatic | 2 · adherent · coherent · inherent | 3 · collected · collimated · colour mated |
Listen again and match the pictures with their descriptions.
Match them with the laser properties
ray, n = beam
sync, n = to be in phase = synchronize
crest, n = top, peak
trough, n [trɒf] = the lowest point of a wave
| 1 |
| a. The rays don't spread outbut instead remain parallel to each other. |
| 2 | 
| b. It is composed of only one wavelength of light. |
| 3 | 
| c. The light is composed of all of the wavelengths of light that we can see. |
| 4 | 
| d. All the raysof light in a beam are in phase, which means that their crests and troughs sync up |
| 5 | 
| e. The light rays are farapart. |
| 6 | 
|
VIDEO
How lasers work (in theory)
https://www.youtube.com/watch?v=y3SBSbsdiYg (till 0:26)
Read the text about how laser works and choose the correct alternative in each case
To make a laser all you need to do is give a big collection/ coalition of atoms enough energy so they're exciting/ excited and ready to emit/ expel light. Once/ Since one of them spontaneously/ simultaneously emits a proton/ photon, it'll motivate/ stimulate some of the others to do so and you get a nice cascade of illumination. But instead of letting all the light enter/ escape, it's more powerful to trap/ hide it between two mirrors/ walls and let it bounce back and forth through the atoms. All that passing light will simulate/ stimulate them to emit even more light. And as long as/ unless you keep on re-exciting the atoms they're happy to go on emitting light forever/ finally.
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Watch the video and check your answers
24. *Read about the difference between beam and ray. Choose the correct variant
| · The direction of the path in which light is traveling is called a ray and is represented in diagrams by a straight line with an arrow on it. · A beam, however, is a stream of light and is shown by a number of rays; it may be parallel, diverging (spreading out) or converging (getting narrower). https://socratic.org/questions/what-is-the-difference-between-a-ray-of-light-and-a-beam-of-light · Rays are only discussed under light, but beams are discussed in both waves and particles. · Wave properties such as wavelength, amplitude, and phase are omitted when a ray is discussed. Any property of the waves or particles can be discussed in a beam. http://www.differencebetween.com/difference-between-ray-and-vs-beam/ |
Beam diagram or ray diagram; X-ray or X-beam; atomic ray or atomic beam; cosmic rays or cosmic beams; gamma ray or gamma beam; collimated ray or collimated beam;ion ray or ion beam
GRAMMAR
Inversion in conditional sentences
| I | Should = If | |
| Should you find the answer … = | If you find the answer … | |
| II | Were you to do = If you did | |
| Were the government to change the law … = | If the government changed the law … | |
| III | Had we … = If we had … | |
| Had we arrived in time …= | If we had arrived in time … | |
| Had we not arrived in time … = | If we hadn’t arrived in time … |
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