| 1 |
Study of hydrogen visible spectrum in |
- A. 1886
- B. 1887
- C. 1895
- D. 1885
|
| 2 |
If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of. |
- A. 3.40 eV
- B. 10.20 eV
- C. 13.6 eV
- D. 3.8 eV
|
| 3 |
1 rem = |
- A. 0.001 SV
- B. 0.01 SV
- C. 0.1 SV
- D. 1.01 SV
|
| 4 |
When an electron in an atom goes from a lower to higher orbit its: |
- A. K.E increases , P.E decreases
- B. K.E increases , P.E increases
- C. K.E decreases , P.E increases
- D. K.E decreases , P.E decreases
|
| 5 |
Which of the following series of hydrogen spectrum lies in ultra violet region. |
- A. Lyman sereis
- B. Paschen series
- C. Balmar series
- D. Bracket series
|
| 6 |
Laser is a beam of light which is |
- A. Monochromatic
- B. Coherent
- C. Unidirectional
- D. All of these
|
| 7 |
The first laser was built by |
- A. ArthursSchawalow
- B. T.H.Maiman
- C. Peter Sorokin
- D. C.H.Townes
|
| 8 |
The longest wavelength of Paschen series is. |
- A. 656 nm
- B. 1094 nm
- C. 1875 nm
- D. 2000 nm
|
| 9 |
The first orbit in the hydrogen atom has a radius. |
- A. 0.53 nm
- B. 0.053 nm
- C. 0.0053 nm
- D. 0.00053 nm
|
| 10 |
The idea of laser device was first introduced by C.H. Towners and Authers Schowlan is |
- A. 1972
- B. 1965
- C. 1958
- D. 1913
|
