| 1 |
Pair production occurs only when energy of photon is at least equal in: |
1.02keV
1.02 eV
1.02 MeV
1.02 GeV
|
| 2 |
A perfect absorber must also be perfect |
Cavity
Sources of radiation
Radiator
None of these
|
| 3 |
De-Broglie waves are associated with |
Moving charged particles only
Moving neutral particles only
All moving particles
All parties whether in motion or at rest
|
| 4 |
Eintein's Photoelectric equation is Ek= hf -∅ in this equation E1, refers to: |
K.E of al the emited electrons
Mean K.E of emited electrons
Maximum K.E of emited electrons
Minimum K.E of emited electrons
|
| 5 |
If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor. |
<b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√</b><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">2</span>
1/<b style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">√</b><span style="font-family: arial, sans-serif; font-size: 16px; color: rgb(34, 34, 34);">2</span>
2
1/2
|
| 6 |
Wave nature of particle was given by: |
Clemensen
Louis de Broglie
Laster H. Germer
Clinton S. Davisson
|
| 7 |
The most refined form of matter is: |
Smoke
Light
Ice
Fog
|
| 8 |
The existence of positron was discovered in: |
1929
1928
1931
1933
|
| 9 |
The converses of annihilation of matter is: |
Photoelectric effect
Relativistic effect
Pair production
Compton effect
|
| 10 |
The minimum energy required for occurrence of pair production is: |
1.022eV
1.02keV
1.02Me.V
1.04MeV
|
| 11 |
When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be. |
Photoelectric effect
Compton effect
Pair production
Annihilation of matter
|
| 12 |
Albert Einstein got noble prize in: |
1926
1921
1918
1931
|
| 13 |
Albert Einstein got noble prize for service in: |
Pair production
Annihilation of matter theory
Compton effect
Photoelectric effect
|
| 14 |
Minimum energy needed to escape an electron ofrm metal surface is called: |
Threshold energy
Threshold frequency
Work function
Work ability
|
| 15 |
The minimum frequency needed to emit an electron form metal surface is called: |
Work function
Threshold frequency
Quanta frequency
All of above
|
| 16 |
The emission of electrons from metal surface when exposed to light is called: |
Compton effect
Pair production
Photoelectric effect
None of above
|
| 17 |
The unit for Plank's constant is: |
Js<sup>-1</sup>
Jm
Js
Jm<sup>2</sup>
|
.gif)
Home
News
Colleges
Courses
Admission
Lectures
Online Test
Past Papers
Date Sheets
Results
Study Abroad
Jobs
Tutors
More
Apps
