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Lasers

Total questions: 20

Worksheet time: 11mins

Name
Class
Date
1.

Full form of LASER

a)

Light Amplification by Spontaneous Emission of Radiation

b)

Light Amplification by Stimulated Emission of Radiation

c)

Light Attenuation by Stimulated emission of Radiation

d)

None of the above

2.

Which is not a characteristic of LASER?

a)

Monochromatic

b)

Directionality

c)

Multiple Wavelength

d)

High Intensity

3.

An electron in ground state is

a)

unstable

b)

stable

c)

fluctuating

d)

vigorous

4.

The atoms _______ energy to raise from a lower energy level to upper energy level

a)

release

b)

absorbs

c)

produce

d)

none of the above

5.

The type of emission of light on its own is called

a)

Spontaneous emission

b)

Stimulated emission

c)

triggered emission

d)

none of the above

6.

The process responsible for laser action

a)

Spontaneous emission

b)

Stimulated emission

c)

Attenuation

d)

Absorption

7.

The rate of absorption transition Rabs depends on

a)

ρ(ν) and N1

b)

ρ(ν) only

c)

N1 only

d)

none of the above

8.

The rate of spontaneous emission Rsp depends only on

a)

N1

b)

N2

c)

ρ(ν)

d)

none of the above

9.
The picture indicates which property ? 
a)
Laser is Monochromatic 
b)
Laser is Coherent
c)
Laser is Directional 
10.

Example of solid state laser is

a)

He-Ne laser

b)

co2co_2 laser

c)

Nd:YAG Laser

d)

Dye laser

11.

He-Ne laser is

a)

three level laser

b)

four level laser

c)

two level laser

d)

five level laser

12.

In He-Ne laser active energy levels for transitions are provided by

a)

Ne atoms

b)

He atoms

c)

Both He and Ne

d)

Co2 atoms

13.

We get continuous laser from

a)

Ruby

b)

Diode

c)

He-Ne

d)

Co2

14.

The coherent nature of light from LASER is due to

a)

Spontaneous emission

b)

Stimulated Emission

c)

Absorption

d)

Pumping

15.

Minimum number of energy states required to achieve population inversion is

a)

1

b)

2

c)

3

d)

4

16.

Laser is a coherent source of light. This means all the light waves....

a)

are out of phase

b)

are in phase

c)

have different directions

d)

have same direction

17.

Gas lasers, solid-state lasers, and diode lasers all rely on which of the following

a)

stimulated emissions and optical resonators

b)

light emitting diodes and HeNe

c)

gasses and mirrors

d)

crystals

18.

LASING action depends on

a)

Spontaneous emission

b)

Stimulated emission

c)

Spontaneous emission followed by stimulated emissions

d)

Absorption of radiation

19.

One quantum (small fixied amount) of light energy is called a .........

a)

Photo

b)

Proton

c)

Photon

d)

Electron

20.

Lifetime of electron in excited state is

a)

10−810^{-8} sec

b)

10−510^{-5} sec

c)

10810^8 sec

d)

10−1010^{-10} sec

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