TEST 6

1. Which of the following sentences about the stimulated emission is true?

a) It proceeds only at temperatures close to the absolute zero.
b) The forcing and the forced photon have the same energy, phase, and the direction of movement.
c) The forcing and the forced photon move in the opposite directions, but their phases are the same.
d) The stimulated emission proceeds only at the temperatures close to those in the stars' cores.

2. What is the main characteristic of the laser light?

a) It is always red.
b) It is coherent.
c) It consists of the photons having small electric charge.
d) It is a visible kind of the infrared waves.

3. When were the X-rays discovered?

a) 1673
b) 1772
c) 1895
d) 1915

4. What are the X-rays?

a) They are the electromagnetic waves.
b) They are the fast moving electrons.
c) They are the hydrogen nuclei.
d) None of those.

5. Why do we use the electron microscopes?

a) Bodies are transparent to them.
b) Thanks to them, the electrically charged bodies can be studied.
c) They give bigger magnification and better sharpness than the optical ones.
d) They give the full colour image.

6. What magnification can be obtained by the electron microscope nowadays?

a) 1 000 000 times
b) 1 000 000 000 times
c) 10 000 times
d) 40 000 times

7. What is used in instead of light in the electron microscope?

a) The beam of the heavy, ionised atoms having a loss of electrons.
b) The beam of the atoms having their electrons almost ionised.
c) The photons dissipating on the electrons.
d) The beam of the electrons.

8. Can single atoms be manipulated nowadays?

TEST 6

1. Which of the following sentences about the stimulated emission is true?

a) It proceeds only at temperatures close to the absolute zero.
b) The forcing and the forced photon have the same energy, phase, and the direction of movement.
c) The forcing and the forced photon move in the opposite directions, but their phases are the same.
d) The stimulated emission proceeds only at the temperatures close to those in the stars' cores.

2. What is the main characteristic of the laser light?

a) It is always red.
b) It is coherent.
c) It consists of the photons having small electric charge.
d) It is a visible kind of the infrared waves.

3. When were the X-rays discovered?

a) 1673
b) 1772
c) 1895
d) 1915

4. What are the X-rays?

a) They are the electromagnetic waves.
b) They are the fast moving electrons.
c) They are the hydrogen nuclei.
d) None of those.

5. Why do we use the electron microscopes?

a) Bodies are transparent to them.
b) Thanks to them, the electrically charged bodies can be studied.
c) They give bigger magnification and better sharpness than the optical ones.
d) They give the full colour image.

6. What magnification can be obtained by the electron microscope nowadays?

a) 1 000 000 times
b) 1 000 000 000 times
c) 10 000 times
d) 40 000 times

7. What is used in instead of light in the electron microscope?

a) The beam of the heavy, ionised atoms having a loss of electrons.
b) The beam of the atoms having their electrons almost ionised.
c) The photons dissipating on the electrons.
d) The beam of the electrons.

8. Can single atoms be manipulated nowadays?