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Q.1: Wave-like characteristic of electron is demonstrated by——-?
- Line spectrum of atoms
- Production of x-rays.
- Diffraction by crystalline solids
- Photoelectric effect
Q.2: Electron cannot exist in the nucleus it is confirmed by observing that——-?
- It does emit radiation
- Its size as compare to proton and neutron is very small
- No antiparticle of electron is present
- The velocity of electron must be very high according to uncertainty principle
Q.3: In normal state of energy the incident high energy photons will be——-?
- Cause X-ray emission
- Cause laser production
Q.4: In laser production the state in which more atoms are in the upper state than in the lower one is called——-?
- Metal stable state
- Normal state
- Inverted population
- All the above
Q.5: The metastable state for an atom in laser light is——-?
- 10-4 sec
- 10-5 sec
- 10-3 sec
- 10-8 sec
Q.6: In He-Ne laser the lasing action is produced by——–?
- Ne only
- He-Ne both
- Electrons of He
- Electrons Ne
Q.7: Reflecting mirrors in laser is used to——-?
- Further stimulation
- Lasing more
- For producing more energetic lasers
Q.8: The velocity of laser light is———-?
- Less than ordinary light
- More than ordinary light
- Equal to ordinary light
- Different for different colours or frequency
Q.9: Electrons present in p-type material due to thermal pair generation are——-?
- majority carriers
- minority carriers
- dual carriers
Q.10: Semi-conductor germanium and silicon are———?