Atomic Spectra

A. Less than ordinary light
B. More than ordinary light
C. Equal to ordinary light
D. Different for different colours or frequency

A. Further stimulation
B. Lasing more
C. For producing more energetic lasers
D. All

A. Ne only
B. He-Ne both
C. Electrons of He
D. Electrons Ne

A. 10-4 sec
B. 10-5 sec
C. 10-3 sec
D. 10-8 sec

A. Metal stable state
B. Normal state
C. Inverted population
D. All the above

A. Stimulated
B. Absorbed
C. Cause X-ray emission
D. Cause laser production

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

A. Line spectrum of atoms
B. Production of x-rays.
C. Diffraction by crystalline solids
D. Photoelectric effect

A. Heating the filament
B. Electron excitation in the gas
C. Ionization of atoms
D. All the above

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