Question

13- Which are more efficient, three-level lasers or four-level lasers?

a- Three-level lasers

b- Four-level lasers

c- They are similar in efficiency

d- Not enough information

22- In the modern atomic model, the electron is considered

a- A wave around the nuclei

b- Going around the nuclei on a circular path

c- Somewhere in a could around the nuclei

d- None of the above

23- What is the wavelength of the photon which has 3 ev of energy?

a- 41.3 nm

b- 413 nm

c- 4130 nm

d- 41300 nm

24- Which of the following is NOT a pumping mechanism for laser systems

a- Chemical reaction

b- Electric current

c- High power light source

d- Diffraction

Answer #1

13)

With
a **four**-**level**
scheme, you
have an extra **level** so that the
**laser** transition does not end
in a ground state. Thus, if the bottom
**level** gets depopulated
faster **than** the top
**level** in the
**laser** transition the population
inversion will be guaranteed independent of how fast or efficiently
you pump the system

**ans is b) 4 level laser is more efficient**

**22) ans is c- Somewhere in a could around the
nuclei**

**23)**

**ans
is option b) 413 nm**

**24)**

**ans is option d) diffraction**

7- Which will have higher energy a- Red photos b- Blue photons
c- Green Photon d- Infrared photon
8- In the modern atomic model, the electron is considered a- A
wave around the nuclei b- Going around the nuclei on a circular
path c- Somewhere in a could around the nuclei d- None of the
above

19- Laser pumping is the process of reflecting light back and
forth in the laser cavity a- True b- False
20- Which are more efficient, three-level lasers or four-level
lasers? a- Three-level lasers b- Four-level lasers c- They are
similar in efficiency d- Not enough information

1.) Which transition in a hydrogen atom would
emit the photon of greatest frequency?
n = 35 to n = 2
n= 6 to n = 2
n = 12 to n = 6
n = 1 to n = 4
n = 2 to n = 9
n = 3 to n = 1
***NOT n=35 to n=2***
2.) Which transition in a hydrogen atom would
absorb the photon of greatest frequency?
n = 3 to n = 1...

1.) Which transition in a hydrogen atom would
emit the photon of greatest frequency?
n = 35 to n = 2
n= 6 to n =
2
n = 12 to n =
6
n = 1 to n = 4
n = 2 to n = 9
n = 3 to n = 1
***NOT n=35 to n=2***
2.) Which transition in a hydrogen atom would
absorb the photon of greatest frequency?
n = 3 to n = 1...

1) Describe an example of each of the following that may be
found of your kitchen: Explain how your choice falls into this
category, and if there is a chemical name or symbol for it, provide
that as well. Provide a photo of your example with your ID card in
it. a) a compound b) a heterogeneous mixture c) an element (symbol)
Moving to the Cavesâ€¦ Lechuguilla Caves specifically. Check out this
picture of crystals of gypsum left behind in...

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