Laboratory Methods Flashcards Preview

Staudt Physics GRE > Laboratory Methods > Flashcards

Flashcards in Laboratory Methods Deck (41)
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1
Q

Poisson distribution

A
2
Q

Poisson waiting time distribution

A
3
Q

Capacitor Z

A

1 / (iωC)

4
Q

Inductor Z

A

Z = iωL

5
Q

Resistor Z

A

R

6
Q

Series impedence

A

Ztot = Σi Zi

7
Q

Parallel impedence

A
8
Q

Max energy of photoelectrons

A
9
Q

Solution to the differential radioactive decay equation

A

N=N0e-λT

10
Q

λ in radioactive decay

A
11
Q

Total lifetime relation if a substance can decay multiple ways

A
12
Q

Best type of laser for spectroscopy over a range of visible wavelengths

A

Dye laser

13
Q

Bremsstrahlung radiation

A

Electrons give up energy in the precense of an electric field by emitting a high-energy photon (usually X-ray)

14
Q

Collisional gas lasers transitions

A

Transitions are due to collisions between atoms.

15
Q

Collisional gas lasers medium

A

Medium is gas or gaseous mixture

16
Q

Collisional gas lasers

A

Transitions are due to collisions between atoms

17
Q

Compton scattering

A

A photon scatters elastically of an atomic electron, which is ejected

18
Q

Compton scattering part of the energy spectrum

A

medium-energy photons (tens of keV)

19
Q

Condition on d for getting a fringe in an interferometer

A

d = mλ / 2

20
Q

Differential radioactive decay equation

A

dN/dt = - λ N

21
Q

Dye laser medium

A

Liquid

22
Q

Dye laser transitions

A

Related to the electron-transfer properties along chains of carbon atoms

23
Q

Free electron laser medium

A

A collection of electrons

24
Q

Free electron laser transition

A

Electrons are forced to accelerate back and forth in an external electric field and emit bremsstrahlung.

25
Q

Interaction of compton scattering

A

Atomic electron

26
Q

Interaction of pair production

A

Atomic nucleus

27
Q

Interaction of photoabsorption

A

The entire atom

28
Q

Molecular gas laser medium

A

Medium is a gas

29
Q

Pair production

A

The electric field near a nucleus induces a photon to produce an electron-positron pair

30
Q

Pair production part of the energy spectrum

A

high-energy photons (tens of MeV and above)

31
Q

Photoabsorption

A

Photon is absorbed by an atom and an electron is emitted

32
Q

Photoabsorption part of the energy spectrum

A

low-energy photons (a few keV)

33
Q

Photoelectric cutoff frequency

A
34
Q

Resonant frequency of an LC circuit

A
35
Q

Semiconductor or diode laser medium

A

A semiconductor

36
Q

Semiconductor or diode laser transitions

A

Electron-hole annihilation between electrons in the bottom of the conduction band and holes at the top of the valence band

37
Q

Solid state laser medium

A

A crystal or glass

38
Q

Solid state laser transitions

A

Between atomic energy levels

39
Q

What are characteristic X-rays?

A

Those emitted when an incident electron collides with and dislodges an inner-shell electron so an outer-shell electron fills the vacancy in the inner shell

40
Q

Compton wavelength

A

λ = h / (mc)

41
Q

Wavelength shift of light due to Compton scattering

A