NEET Test Series from KOTA - 10 Papers In MS WORD
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Dual nature of radiation and Matter
142662
In ruby laser, the stimulated emission is due to transition from :
1 metastable state to any lower state
2 any higher state to lower state
3 metastable state to ground state
4 any higher state to ground state
Explanation:
C In ruby laser, the stimulated emission is due to transition from metastable state to ground state, As the excited atoms return their ground state, they release their excess energy in the form of photons. These photons stimulate other excited atoms to release their energy in phase, producing coherent beam of light.
Karnataka CET-2009
Dual nature of radiation and Matter
142664
The population inversion necessary for laser action used in solid state lasers is
1 electrical discharge
2 inelastic atom-atom collision
3 direct conversion
4 optical pumping
Explanation:
D To achieve population inversion in a solid state laser, the pumping rate must be higher than the rate of non-radioactive decay, which means that the excited ions must be able to relax to their ground state by emitting a photon, rather than loosing their energy to the surrounding environment through other process, such as vibration. This can be achieved by carefully controlling the doping concentration and the pumping parameters of the laser.
SRMJEEE - 2012
Dual nature of radiation and Matter
142665
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
1 excitation of electrons in the atoms
2 collision between the atoms of the gas
3 collisions between the charged particles emitted from the cathode and the atoms of the gas
4 collision between different electrons of the atoms of the gas
Explanation:
C When electric discharge through gases at low pressure, they collide with atoms of the gas present in the tube and this lead to coloured glow in cathode ray tubes. **H. Einstein Theory of Relativity**
AIPMT - 2008
Dual nature of radiation and Matter
142668
The time interval between two event in a reference frame which is in motion is
1 Maximum
2 Minimum
3 No interval
4 None
Explanation:
A If the time internal between two events is different as measured in two frame, then typically it will be maximum because of the different synchronization of the frame clocks that events are being compared to, and only secondarily because of the rates of the clocks.
142662
In ruby laser, the stimulated emission is due to transition from :
1 metastable state to any lower state
2 any higher state to lower state
3 metastable state to ground state
4 any higher state to ground state
Explanation:
C In ruby laser, the stimulated emission is due to transition from metastable state to ground state, As the excited atoms return their ground state, they release their excess energy in the form of photons. These photons stimulate other excited atoms to release their energy in phase, producing coherent beam of light.
Karnataka CET-2009
Dual nature of radiation and Matter
142664
The population inversion necessary for laser action used in solid state lasers is
1 electrical discharge
2 inelastic atom-atom collision
3 direct conversion
4 optical pumping
Explanation:
D To achieve population inversion in a solid state laser, the pumping rate must be higher than the rate of non-radioactive decay, which means that the excited ions must be able to relax to their ground state by emitting a photon, rather than loosing their energy to the surrounding environment through other process, such as vibration. This can be achieved by carefully controlling the doping concentration and the pumping parameters of the laser.
SRMJEEE - 2012
Dual nature of radiation and Matter
142665
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
1 excitation of electrons in the atoms
2 collision between the atoms of the gas
3 collisions between the charged particles emitted from the cathode and the atoms of the gas
4 collision between different electrons of the atoms of the gas
Explanation:
C When electric discharge through gases at low pressure, they collide with atoms of the gas present in the tube and this lead to coloured glow in cathode ray tubes. **H. Einstein Theory of Relativity**
AIPMT - 2008
Dual nature of radiation and Matter
142668
The time interval between two event in a reference frame which is in motion is
1 Maximum
2 Minimum
3 No interval
4 None
Explanation:
A If the time internal between two events is different as measured in two frame, then typically it will be maximum because of the different synchronization of the frame clocks that events are being compared to, and only secondarily because of the rates of the clocks.
142662
In ruby laser, the stimulated emission is due to transition from :
1 metastable state to any lower state
2 any higher state to lower state
3 metastable state to ground state
4 any higher state to ground state
Explanation:
C In ruby laser, the stimulated emission is due to transition from metastable state to ground state, As the excited atoms return their ground state, they release their excess energy in the form of photons. These photons stimulate other excited atoms to release their energy in phase, producing coherent beam of light.
Karnataka CET-2009
Dual nature of radiation and Matter
142664
The population inversion necessary for laser action used in solid state lasers is
1 electrical discharge
2 inelastic atom-atom collision
3 direct conversion
4 optical pumping
Explanation:
D To achieve population inversion in a solid state laser, the pumping rate must be higher than the rate of non-radioactive decay, which means that the excited ions must be able to relax to their ground state by emitting a photon, rather than loosing their energy to the surrounding environment through other process, such as vibration. This can be achieved by carefully controlling the doping concentration and the pumping parameters of the laser.
SRMJEEE - 2012
Dual nature of radiation and Matter
142665
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
1 excitation of electrons in the atoms
2 collision between the atoms of the gas
3 collisions between the charged particles emitted from the cathode and the atoms of the gas
4 collision between different electrons of the atoms of the gas
Explanation:
C When electric discharge through gases at low pressure, they collide with atoms of the gas present in the tube and this lead to coloured glow in cathode ray tubes. **H. Einstein Theory of Relativity**
AIPMT - 2008
Dual nature of radiation and Matter
142668
The time interval between two event in a reference frame which is in motion is
1 Maximum
2 Minimum
3 No interval
4 None
Explanation:
A If the time internal between two events is different as measured in two frame, then typically it will be maximum because of the different synchronization of the frame clocks that events are being compared to, and only secondarily because of the rates of the clocks.
142662
In ruby laser, the stimulated emission is due to transition from :
1 metastable state to any lower state
2 any higher state to lower state
3 metastable state to ground state
4 any higher state to ground state
Explanation:
C In ruby laser, the stimulated emission is due to transition from metastable state to ground state, As the excited atoms return their ground state, they release their excess energy in the form of photons. These photons stimulate other excited atoms to release their energy in phase, producing coherent beam of light.
Karnataka CET-2009
Dual nature of radiation and Matter
142664
The population inversion necessary for laser action used in solid state lasers is
1 electrical discharge
2 inelastic atom-atom collision
3 direct conversion
4 optical pumping
Explanation:
D To achieve population inversion in a solid state laser, the pumping rate must be higher than the rate of non-radioactive decay, which means that the excited ions must be able to relax to their ground state by emitting a photon, rather than loosing their energy to the surrounding environment through other process, such as vibration. This can be achieved by carefully controlling the doping concentration and the pumping parameters of the laser.
SRMJEEE - 2012
Dual nature of radiation and Matter
142665
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
1 excitation of electrons in the atoms
2 collision between the atoms of the gas
3 collisions between the charged particles emitted from the cathode and the atoms of the gas
4 collision between different electrons of the atoms of the gas
Explanation:
C When electric discharge through gases at low pressure, they collide with atoms of the gas present in the tube and this lead to coloured glow in cathode ray tubes. **H. Einstein Theory of Relativity**
AIPMT - 2008
Dual nature of radiation and Matter
142668
The time interval between two event in a reference frame which is in motion is
1 Maximum
2 Minimum
3 No interval
4 None
Explanation:
A If the time internal between two events is different as measured in two frame, then typically it will be maximum because of the different synchronization of the frame clocks that events are being compared to, and only secondarily because of the rates of the clocks.
