Reflecting mirrors in laser is used to
A. Further stimulation
B. Lasing more
C. For producing more energetic lasers
D. All
Reflecting mirrors in laser is used to Read More »
Physics
In He-Ne laser the lasing action is produced by
A. Ne only
B. He-Ne both
C. Electrons of He
D. Electrons Ne
In He-Ne laser the lasing action is produced by Read More »
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
The metastable state for an atom in laser light is Read More »
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
Answer: Option B
In normal state of energy the incident high energy photons will be Read More »
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 present
D. The velocity of electron must be very high according to uncertainty principle
Electron cannot exist in the nucleus it is confirmed by observing that Read More »
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
Wave-like characteristic of electron is demonstrated by Read More »
UV radiation can be produced by
A. Heating the filament
B. Electron excitation in the gas
C. Ionization of atoms
D. All the above
UV radiation can be produced by Read More »
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 in a diffraction grating
D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
X-rays are diffracted by a crystal but not by a diffraction grating because Read More »
Maximum frequency in the spectrum from X-ray tube is directly proportional to the
A. Number of incident electron i.e. filament current
B. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
C. The soft target which can easily emit electrons
D. All of above are correct
Maximum frequency in the spectrum from X-ray tube is directly proportional to the Read More »