The velocity of laser light is___________________?
The velocity of laser light is___________________? A. Less than ordinary light B. More than ordinary lightC. Equal to ordinary light D. Different for different colours or frequency
The velocity of laser light is___________________? A. Less than ordinary light B. More than ordinary lightC. Equal to ordinary light D. Different for different colours or frequency
Reflecting mirrors in laser is used to______________? A. Further stimulation B. Lasing more C. For producing more energetic lasers D. All
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 secC. 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 stateC. Inverted population D. All the above
In normal state of energy the incident high energy photons will be______________? A. StimulatedB. Absorbed C. Cause X-ray emission D. Cause laser production
Electron cannot exist in the nucleus it is confirmed by observing that______________? A. It does emit radiation B. Its size as compare to proton and neutron is very small C. No antiparticle of electron is presentD. The velocity of electron…
Wave-like characteristic of electron is demonstrated by______________? A. Line spectrum of atoms B. Production of x-rays.C. Diffraction by crystalline solids D. Photoelectric effect
UV radiation can be produced by______________? A. Heating the filamentB. Electron excitation in the gas C. Ionization of atoms D. All the above
X-rays are diffracted by a crystal but not by a diffraction grating because_____________? A. The ions in a crystal are well arranged B. The lines in a diffraction grating cannot reflect X-rays. C. The penetration power of X-rays is high…