Define: Optical pumping & Population Inversion.

Define: Optical pumping & Population Inversion. 
by

1 Answer

Answer :

Optical pumping:- The process of raising the atoms from lower energy state to higher energy state using light medium is called optical pumping. 

Population inversion:- Making the population of higher energy level more than population of lower energy level by using light energy is called population inversion.
by

Related questions

Which of the following compounds loses optical activity due to pyramidal inversion?

Description : Which of the following compounds loses optical activity due to pyramidal inversion?

Last Answer : Which of the following compounds loses optical activity due to pyramidal inversion? A. B. C. D.

Which of the following contributes to the broadening of laser emission bandwidth? a. Doppler shift of moving atoms and molecules b. Amplification within the laser medium c. Coherence of the laser light d. Optical pumping of the laser transition

Description : Which of the following contributes to the broadening of laser emission bandwidth? a. Doppler shift of moving atoms and molecules b. Amplification within the laser medium c. Coherence of the laser light d. Optical pumping of the laser transition

Last Answer : a. Doppler shift of moving atoms and molecules

Which of the following contributes to the broadening of laser emission bandwidth? ∙ a. Doppler shift of moving atoms and molecules ∙ b. Amplification within the laser medium ∙ c. Coherence of the laser light ∙ d. Optical pumping of the laser transition

Description : Which of the following contributes to the broadening of laser emission bandwidth? ∙ a. Doppler shift of moving atoms and molecules ∙ b. Amplification within the laser medium ∙ c. Coherence of the laser light ∙ d. Optical pumping of the laser transition

Last Answer : Doppler shift of moving atoms and molecules

The scientific principle involved in a laser is (a) Newton’s laws of motion (b) Faraday’s laws of induction (c) Motion of a charges particle in an electromagnetic field (d) Amplification by population inversion

Description : The scientific principle involved in a laser is (a) Newton’s laws of motion (b) Faraday’s laws of induction (c) Motion of a charges particle in an electromagnetic field (d) Amplification by population inversion

Last Answer : Ans:(d)

An atomic energy state in which more atoms are in the lower energy state E1 than in the excited state E2, is known as a) population inversion b) normal population c) stimulated population d) atomic population

Description : An atomic energy state in which more atoms are in the lower energy state E1 than in the excited state E2, is known as a) population inversion b) normal population c) stimulated population d) atomic population

Last Answer : b) normal population

Define following terms (i) Kinematic link (ii) Kinematic pair (iii) Kinematic chain (iv) Mechanism (v) Machine (vi) Inversion

Description : Define following terms (i) Kinematic link (ii) Kinematic pair (iii) Kinematic chain (iv) Mechanism (v) Machine (vi) Inversion

Last Answer : (i) Kinematic link: Each part of a machine, which moves relative to some other part, is known as a kinematic link.  (ii) Kinematic pair: The two links or elements of a machine, ... obtaining different mechanisms by fixing different links in a kinematic chain is known as inversion of the mechanism.

Inversion of sucrose produces (A) Fructose (B) Glucose (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Inversion of sucrose produces (A) Fructose (B) Glucose (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (B) Glucose

A mixed flow centrifugal pump (A) Employs such an impeller, through which the flow is a combination of radial & axial flow (B) Mixes the two fluids before pumping them (C) Pumps the two fluids separately and then mixes them (D) Employs impellers in both the radial & axial directions

Description : A mixed flow centrifugal pump (A) Employs such an impeller, through which the flow is a combination of radial & axial flow (B) Mixes the two fluids before pumping them (C) Pumps the two fluids separately and then mixes them (D) Employs impellers in both the radial & axial directions

Last Answer : (A) Employs such an impeller, through which the flow is a combination of radial & axial flow

A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). (A) Less head & capacity (B) More head (C) More capacity (D) Less head & more capacity

Description : A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). (A) Less head & capacity (B) More head (C) More capacity (D) Less head & more capacity

Last Answer : (A) Less head & capacity

Solar photovoltaic devices encouraged their use for water . A) Pumping. C) Lighting B) Both A & C. D) None of the above.

Description : Solar photovoltaic devices encouraged their use for water . A) Pumping. C) Lighting B) Both A & C. D) None of the above.

Last Answer : PUMPING

Can you get stuck upside down on an inversion table?

Description : Can you get stuck upside down on an inversion table?

Last Answer : Yes

How to reduce effect of temperature inversion?

Description : How to reduce effect of temperature inversion?

Last Answer : Welcome to fluther. This sounds like a homework question and we don’t answer them here but we’ll point you in a direction to look. Are you talking gas, fluid, or solid?

What is Inversion ?

Description : What is Inversion ?

Last Answer : The position of the verb in front of the subject is called inversion , which is the opposite of the general order of a sentence.

After thermal inversion, pollutants pile up in

Description : After thermal inversion, pollutants pile up in

Last Answer : After thermal inversion, pollutants pile up in A. Hanging cool air B. Hanging warm air C. At the boundary of cool and warm airs D. Soil

In thermal inversion.

Description : In thermal inversion.

Last Answer : In thermal inversion. A. Warm ground air gets overlapped by cool air B. Cool ground air gets ... winter D. Ground temperature becomes low in summer.

Above the inversion temperature, `mu` (J.T. coefficient)

Description : Above the inversion temperature, `mu` (J.T. coefficient)

Last Answer : Above the inversion temperature, `mu` (J.T. coefficient) A. Is positive B. Is zero C. Is negative D. Depends on the gas

(A) In `S_(N^(2))` reactions, complete inversion of configuration takes place. (R) In `S_(N^(1))` reactions, retention but not the inversion takes pla

Description : (A) In `S_(N^(2))` reactions, complete inversion of configuration takes place. (R) In `S_(N^(1))` reactions, retention but not the inversion takes pla

Last Answer : (A) In `S_(N^(2))` reactions, complete inversion of configuration takes place. (R) In `S_(N^(1))` ... . D. IF (A) is incorrect but (R) is correct.

Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it gets

Description : Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it gets

Last Answer : Inversion temperature of helium is very low. So when helium is allowed to expand into vacuum it ... Heated C. Neither cooled, nor heated D. Liquified

What is the bottom note in a first inversion triad?

Description : What is the bottom note in a first inversion triad?

Last Answer : In 1st inversion, the 3rd of the chord is on the bottom. For theexample of C major, the E is the lowest note.

What is an inversion table used for?

Description : What is an inversion table used for?

Last Answer : Inversion tables are designed to decompress the spine by taking the weight off it. You strap yourself in and are turned upside down. Supposedly this will alleviate Back pain.

What is the purpose of inversion tables?

Description : What is the purpose of inversion tables?

Last Answer : Inversion tables are used to relieve Back pain. You strap yourself to the table and it allows your body to lie on your back in an inverted position. This relaxes the muscles and ligaments surrounding the spine.

Are inversion tables safe to use if you have high blood pressure?

Description : Are inversion tables safe to use if you have high blood pressure?

Last Answer : Yes, you can use the inversion tables safely even if you have high blood pressure. The best advice would be to check with your doctor for time limits while using the table and warning signs if a problem arises.

Can inversion tables help with migraines?

Description : Can inversion tables help with migraines?

Last Answer : There have been some reports of inversion helping to reduce migraines but there is no medical report that supports that claim. In fact often times due to the nature of inversion, it could increase the severity of a migraine.

How do inversion tables work?

Description : How do inversion tables work?

Last Answer : An inversion table is used to invert the body at a steep angle. This is claimed to treat Back pain, but is regarded by the medical community as a quack treatment.

The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation

Description : The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation

Last Answer : Ans. ((d))

A small hole in the window of a closed room forms an inverted image of outside building on the opposite wall of the room. This happens because (a) the rays of light suffer lateral inversion on entering the hole (b) of the rectilinear propagation of light (c) the hole acts as a convex lens (d) the hole acts as a prism

Description : A small hole in the window of a closed room forms an inverted image of outside building on the opposite wall of the room. This happens because (a) the rays of light suffer lateral inversion on entering the ... propagation of light (c) the hole acts as a convex lens (d) the hole acts as a prism

Last Answer : Ans:(b)

Atmospheric temperature increasing at the higher altitudes is called – (1) Radiation (2) Inversion (3) Conduction (4) Convection

Description : Atmospheric temperature increasing at the higher altitudes is called – (1) Radiation (2) Inversion (3) Conduction (4) Convection

Last Answer : (2) Inversion Explanation: The reversal of the normal behaviour of temperature in the troposphere in which a layer of cool air at the surface is overlain by a layer of warmer ... as temperature inversion. Inversions play an important role in determining cloud forms, precipitation, and visibility.

What do you call the increase of temperature with height? A. Temperature inversion B. Normal inversion C. Ducting D. Superrefraction

Description : What do you call the increase of temperature with height? A. Temperature inversion B. Normal inversion C. Ducting D. Superrefraction

Last Answer : A. Temperature inversion

Temperature inversion is

Description : Temperature inversion is

Last Answer : Positive Lapse Rate

____ is a weather-based indicator for assessing crop development [a] Growing Degree Days [b] Thermal Death Point [c] Sun Clad [d] Heat Units [e] Temperature Inversion

Description : ____ is a weather-based indicator for assessing crop development [a] Growing Degree Days [b] Thermal Death Point [c] Sun Clad [d] Heat Units [e] Temperature Inversion

Last Answer : [c] Sun Clad

The movement of a gene from one linkage group to another is called (a) translocation (b) crossing over (c) inversion (d) duplication

Description : The movement of a gene from one linkage group to another is called (a) translocation (b) crossing over (c) inversion (d) duplication

Last Answer : (c) inversion

The mechanism that causes a gene to move from one linkage group to another is called (a) inversion (b) duplication (c) translocation (d) crossing-over.

Description : The mechanism that causes a gene to move from one linkage group to another is called (a) inversion (b) duplication (c) translocation (d) crossing-over.

Last Answer : (c) translocation

Inversion of cane sugar is an example of (A) Unimolecular reaction with first order (B) Bimolecular reaction with second order (C) Bimolecular reaction with first order (D) Unimolecular reaction with second order

Description : Inversion of cane sugar is an example of (A) Unimolecular reaction with first order (B) Bimolecular reaction with second order (C) Bimolecular reaction with first order (D) Unimolecular reaction with second order

Last Answer : (C) Bimolecular reaction with first order

. Irreversible precipitation of proteins caused by heating is called : (a) Polymerisation (b) Denaturation (c) Electrophoresis (d) Inversion

Description : Irreversible precipitation of proteins caused by heating is called : (a) Polymerisation (b) Denaturation (c) Electrophoresis (d) Inversion

Last Answer : Denaturation

The movement of soil across a tool surface without sticking is called as a. Pulverisation b. Inversion c. Scouring d. Turning

Description : The movement of soil across a tool surface without sticking is called as a. Pulverisation b. Inversion c. Scouring d. Turning

Last Answer : c. Scouring

DIP stands for: a) Domain Inversion Principle b) Diodic Inversion Principle c) Dependency Inversion Principle d) None of These

Description : DIP stands for: a) Domain Inversion Principle b) Diodic Inversion Principle c) Dependency Inversion Principle d) None of These

Last Answer : c) Dependency Inversion Principle

Hydrolysis of sugar is called (A) Hydration (B) Inversion (C) Esterification (D) None of these

Description : Hydrolysis of sugar is called (A) Hydration (B) Inversion (C) Esterification (D) None of these

Last Answer : (B) Inversion

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature. (A) Boyle (B) Inversion (C) Critical (D) Reduced

Description : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature. (A) Boyle (B) Inversion (C) Critical (D) Reduced

Last Answer : (A) Boyle

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature. (A) Critical (B) Boyle (C) Inversion (D) Reduced

Description : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature. (A) Critical (B) Boyle (C) Inversion (D) Reduced

Last Answer : (B) Boyle

The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is (A) ∞ (B) 1 (C) 0 (D) -ve

Description : The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is (A) ∞ (B) 1 (C) 0 (D) -ve

Last Answer : (C) 0

All gases above its inversion temperature, in a throttling process will show (A) A heating effect (B) No change in temperature (C) A cooling effect (D) Either (A) or (C)

Description : All gases above its inversion temperature, in a throttling process will show (A) A heating effect (B) No change in temperature (C) A cooling effect (D) Either (A) or (C)

Last Answer : (A) A heating effect

Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. (A) Below (B) At (C) Above (D) Either 'b' or 'c'

Description : Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. (A) Below (B) At (C) Above (D) Either 'b' or 'c'

Last Answer : A) Below

Joule-Thomson Co-efficient at any point on the inversion curve is (A) ∞ (B) +ve (C) 0 (D) -ve

Description : Joule-Thomson Co-efficient at any point on the inversion curve is (A) ∞ (B) +ve (C) 0 (D) -ve

Last Answer : (C) 0

Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is (A) 0 (B) ∞ (C) +ve (D) -ve

Description : Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is (A) 0 (B) ∞ (C) +ve (D) -ve

Last Answer : (A) 0

Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion temperature is same for all gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

Description : Which one is true for a throttling process? (A) A gas may have more than one inversion temperatures (B) The inversion temperature is different for different gases (C) The inversion ... gases (D) The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

Last Answer : (B) The inversion temperature is different for different gases

The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the (A) Critical point (B) Curie temperature (C) Inversion temperature (D) Eutectic temperature

Description : The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the (A) Critical point (B) Curie temperature (C) Inversion temperature (D) Eutectic temperature

Last Answer : (B) Curie temperature

Which of the following terms refers to moving away from midline? a) Abduction Abduction is moving away from midline. b) Adduction Adduction is moving toward midline. c) Inversion Inversion is turning inward. d) Eversion Eversion is turning outward.

Description : Which of the following terms refers to moving away from midline? a) Abduction Abduction is moving away from midline. b) Adduction Adduction is moving toward midline. c) Inversion Inversion is turning inward. d) Eversion Eversion is turning outward.

Last Answer : a) Abduction Abduction is moving away from midline.

Stubble bottom mold board is used where a) Pulverization is needed b) Inversion is needed c) Both d) None of these Ans. a

Description : Stubble bottom mold board is used where a) Pulverization is needed b) Inversion is needed c) Both d) None of these Ans. a

Last Answer : ans a

Sod bottom mold board is used where a) Pulverization is needed b) Inversion is needed c) Both d) None of these Ans. b

Description : Sod bottom mold board is used where a) Pulverization is needed b) Inversion is needed c) Both d) None of these Ans. b

Last Answer : ans b

The radiation emitted by a body as a result of its temperature.  a. Blackbody Radiation  b. Thermal Inversion  c. Thermionic Inversion  d. Thermal Radiation

Description : The radiation emitted by a body as a result of its temperature.  a. Blackbody Radiation  b. Thermal Inversion  c. Thermionic Inversion  d. Thermal Radiation

Last Answer : Thermal Radiation