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

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. Reflecting mirrors in laser is used to______________?

   A. Further stimulation
   B. Lasing more
   C. For producing more energetic lasers
   D. All

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. The velocity of light was determined accurately by_______________?

   A. Newton
   B. Michelson
   C. Huygen
   D. Young

6. Random errors can be reduced by_______________?

   A. Taking zero correction
   B. Comparing the instrument with another more accurate one
   C. Taking mean of several measurements
   D. All methods explained in A, B and C

7. The period of a circular motion is given by_______________?

   A. T = πv
   B. T = πw
   C. T = 2πr
   D. T = 2πr/v

8. The restoring force acting on the simple pendulum is given by_______________?

   A. mg sin θ
   B. mg sin θ
   C. mg cos θ
   D. mg cos θ

9. Einstein’s photoelectric equation is given by_______________?

   A. 1/2 mvmax2=hf+Φ
   B. 1/2 mvmax2-hf = Φ
   C. 1/2 mvmax2=hf-Φ
   D. All of above are correct

10. The equation θ = 1.22 λ/D was devised by_______________?

    A. Newton
    B. Einstein
    C. Raleigh
    D. Planks