| 1 |
The existence of positron in 1928 was predicted by |
- A. Anderson
- B. Dirac
- C. Chadwick
- D. Plank
|
| 2 |
Eintein's Photoelectric equation is E<sub>k</sub>= hf -∅ in this equation E<sub>1</sub>, refers to: |
- A. K.E of al the emited electrons
- B. Mean K.E of emited electrons
- C. Maximum K.E of emited electrons
- D. Minimum K.E of emited electrons
|
| 3 |
Photodiode is used for wave nature of. |
- A. Light
- B. Thermal radiation
- C. Radi waves
- D. Sound waves
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| 4 |
The value of Stefan is constant is: |
- A. 4.57 x 10<sup>-8</sup> m<sup>2</sup>k<sup>2</sup>
- B. 5.67 x10<sup>-8</sup> wm<sup>-2</sup>k<sup>-4</sup>
- C. 6.67x 10<sup>-11</sup> wm<sup>2</sup>k<sup>4</sup>
- D. 7.45 x 10<sup>-9</sup> m<sup>2</sup> wk<sup>3</sup>
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| 5 |
The unit of Plank's constant 'h' is. |
- A. JC
- B. J/C
- C. JS
- D. J/S
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| 6 |
In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of. |
- A. 90<sup>o</sup>C
- B. Zero
- C. 120<sup>o</sup>C
- D. 45<sup>o</sup>C
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| 7 |
The emission of electrons from metal surface when exposed to light is called: |
- A. Compton effect
- B. Pair production
- C. Photoelectric effect
- D. None of above
|
| 8 |
Potassium Cathodes in photocell emit electrons for a light. |
- A. Visible
- B. Infra red
- C. Ultra violet
- D. X rays
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| 9 |
The energy of the photon of wavelength 500 nm is. |
- A. 3.10 eV
- B. 2.49 eV
- C. 1.77 eV
- D. 1.52 eV
|
| 10 |
The minimum energy required for occurrence of pair production is: |
- A. 1.022eV
- B. 1.02keV
- C. 1.02Me.V
- D. 1.04MeV
|