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
When X-rays are passed through successive aluminum sheets what happens to their thickness ?
(A) increases
(B) it decreases
(C) it remains same
(D) sometimes increases and sometimes decreases
X-rays are similar in nature to_______________?
(A) Cathode rays
(B) Positive rays
(C) γ-rays
(D) Beta rays
In an electronic transition atom cannot emit______________?
(A) γ-rays
(B) Infra red radiation
(C) Visible light
(D) Ultraviolet rays
Radiation with wavelength longer than red lights______________?
(A) ultraviolet rays
(B) X-rays
(C) infra red radiation
(D) visible radiation
Reverse process of photoelectric effect is_______________?
(A) pair production
(B) Compton effect
(C) annihilation of matter
(D) X-rays production
In He-Ne laser the lasing action is produced by_______________?
(A) Ne only
(B) He-Ne both
(C) Electrons of He
(D) Electrons Ne
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
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
In normal state of energy the incident high energy photons will be______________?
(A) Stimulated
(B) Absorbed
(C) Cause X-ray emission
(D) Cause laser production