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Choose the correct answer to the following questions.
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1. What is a laser?
a) It is a device which converts one form of energy into another.
b) It is a device which produces pure intense beams of light and radiation.
c) It is a device which transmits electrical energy into the nuclear one.
2. Which of the following directions can a laser be used in?
a) It can be used for cooking meals.
b) It can be used in the system of education.
c) It can be used in eye surgery.
3. What gas is used to cut through brick and granite?
a) CO2.
b) Argon.
c) Helium.
4. Which of the laser qualities is used as a means of
measurement?
a) The strength.
b) The accuracy.
c) The sensitivity.
5. What is the density of semiconductor laser radiation?
a) It is hundreds of thousands of times smaller than that of the best ruby laser.
b) It is thousands of times smaller than that of the best ruby laser.
с) It is hundreds of thousands of times greater than that of the best ruby laser.
5.8. Write the correct question for the following sentences, as in the
model.
Model: –In the nearest future lasers will be used in the sphere of
communication. (In what sphere …)
– In what sphere of technology will the lasers be used in the nearest future?
1. Lasers produce pure, intense beams of light and radiation. (What …)
2. The invention of the laser was called “a solution waiting for a
problem”. (How …)
3. Surgeons performing operations have found the laser as a surgical knife which is able to make bloodless incisions. (Who …)
4. Yes, it is. The semiconductor laser is able to transform electrical
energy directly into the light wave one.
5. The accuracy of the laser beam has allowed the scientists to calculate the speed of light more precisely. (What …)
6. It is the field of communication where the laser technology will find the most extensive application in future. (Where …)
7. The use of laser reflectors allowed the American astronauts to
determine the exact distance from the moon to the Earth. (What …)
8. The most interesting thing about the semiconductor laser is its ability to transform electrical energy directly into the light wave one. (What …)
9. Semiconductor quantum generators were developed in 1960. (When …)
10. Yes, there is. There are a lot of possibilities for the laser technology not only in science and technology, but in everyday life, either.
5.9. Work in pairs and discuss the answers to the following
questions.
1. When were lasers invented?
2. Was the invention of lasers a real revolution in technology?
3. What types of lasers do you know?
4. What spheres of science and technology are lasers used in?
5. What will the laser technologies be like in future? Where will they
be used?
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ROBOTS
Pretext exercises
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