Reflecting mirrors in laser is used to______________?

Related Mcqs:

1. In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?

   A. Metal stable state
   B. Normal state
   C. Inverted population
   D. All the above

2. The metastable state for an atom in laser light is_____________?

   A. 10-4 sec
   B. 10-5 sec
   C. 10-3 sec
   D. 10-8 sec

3. In He-Ne laser the lasing action is produced by_______________?

   A. Ne only
   B. He-Ne both
   C. Electrons of He
   D. Electrons Ne

4. The velocity of laser light is___________________?

   A. Less than ordinary light
   B. More than ordinary light
   C. Equal to ordinary light
   D. Different for different colours or frequency

5. I ^. (j^ x k^) is equal to______________?

   A. 1
   B. i^
   C. j^
   D. k^

6. One radian is equal to______________?

   A. 67.3°
   B. 57.3°
   C. 87.3°
   D. 60°

7. Normal human body temperature 98.6°F corresponds to______________?

   A. 37°C
   B. 42°C
   C. 55°C
   D. 410°C

8. In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

   A. Balmer series
   B. Pfund series
   C. Bracket series
   D. Lymann series

9. Photon of highest frequency will be absorbed when transition takes place from_____________?

   A. 1st to 5th orbit
   B. 2nd to 5th orbit
   C. 3rd to 5th orbit
   D. 4th to 5th orbit

10. Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?

    A. A & B
    B. B & C
    C. A & C
    D. A B & C