Exponential Evidence for Quantum Mechanics Pt. 1 Flashcards
William __ developed a modification of the Geissler tube into what is known as the __ tube to demonstrate and study these rays, later determined to be a stream of electrons.
Crookes
Discovered clean metal surfaces emit charges when exposed to UV light. Unit of frequency named after him.
Hertz
The simpliest definition describes a __object as a perfect absorber of EM waves
Blackbody
Planck’s constant divided by 2*π
H-Bar
6.626 E -34 J*s
Planck’s Constant
To state without proof or justification
Postulate
A Johns Hopkins Univ faculty member who developed high quality diffraction gratings which replaced slits for studying colors of light
Henry Augustus Rowland
A satellite, launched in 1989, which mapped in great detail the microwave emissions in the universe.
COBE
In 1885, came up with an empirical formula which explained the 4 visible lines in the hydrogen diffraction grating spectrum
Johann Balmer
Max__ discovered the relationship between the energy of a photon and its frequency, E = hf
Planck
Wilhelm __. Realized cathode rays were negatively charged
Hallwacks
A device that can be made by cutting two (or more) narrow slits in a piece of aluminum foil. Also used to separate light into its component colors
Slits
Unit of energy typically used in kindergarten physics
Joule
Heinrich __ is credited with building early gas discharge tubes used to demonstrate the principles of electric glow discharge, similar to modern neon lighting
Geissler
Launched in 2001, this probe has made high angular resolution measurements of the microwave background
WMAP
This material was a significant impediment to the sensitivity of the Bell Laboratory’s Holmdel NJ antenna..
Pigeon poop
Photons produced when charged particles slow down extremely rapidly
Bremsstralung
A computed tomography scan makes use of computer-processed combinations of many X-ray measurements…
Cat-Scan
511keV
Electron mc2
1.602E-19 J
Electronvolt
An imaging technique commonly used by physicians to obtain real-time moving images of the internal structures of a patient
Fluoroscopy
1.602E-19 Coulombs
Fundamental-Charge
A curious calculation questioning why the sky is dark at night
Olbers’ Paradox
The photoelectric effect demonstrated that EM waves have fixed energies determined by the frequency, rather than an adjustable energy implied by the __ vector.
Poynting
Mysterious rays orignating from Crookes tubes which could not be deflected by a magnetic field, but which caused photographic plates to be exposed
Xrays
Photons of energy greater than the work function eject electrons from a slab of material.
KE = energy of incoming photon - work function of the material
A wedge, usually made out of glass, used to separate light into its component colors in the ancient days
Prism
Scientists realized the Balmer forumla could be extended to describe hydrogen atom transitions in the UV and IR regions. The generalized formula became known as the __ formula
Rydberg
The Rayleigh-Jeans formula indicates the most intense wavelength would be in the far-UV, in contrast to measurements which indicate no emission in the UV
Ultraviolet Catastrophe
1.055E-34 J*s
H Bar
Usually, detection of radiation in the long-IR range of the EM spectrum and produce images of that radiation, called thermograms.
Thermal-imaging
The conditions of the universe 380,000 years after the Big Bang are now evident as Cosmic Microwave Background radiation described by a __ degree blackbody spectrum
2.7
The minimum energy required to remove an electron from a particular material. Now-a-days we would probably call it the electron binding energy
Work Function
A formula which gives the mazximum wavelength of emission from a blackbody radiator
Weins-Displacement
12345 eV*Angstrom
Approx. h*c
Phillip__. He discovered that the energy of the electrons ejected from a cathode depends only on wavelength, and not the intensity of, the incident light.
Lenard (Leonard?)
the voltage applied between ends of the photoeffect vacuum tubes to prevent electrons from traversing the tube.
Stopping Potential
Demonstrated that the cathode rays were negatively charged and measured their charge/mass ratio
J.J. Thompson
1240 eV nm
H Bar*c
Unit of energy used when discussing electron structure and electronic configurations
Electron Volt
4.15 E eV*s
Plancks Const
A formula which predicts the total intensity emitted from a surface at a given temperature
Stefan-Boltzmannn
A formula, dereived from classical EM physics and thermodynamicsm, to predict the emitted intensity as a function of wavelength
Rayleigh-Jeans
Distribution function used by Einstein to fudge the DeBye calculation and thereby obtain a better quality agreement with the specific hear as a functin of temperature
Planck Blackbody
An idea to solve the UV-catastrophe by assuming some sort of oscillators are responsible for the blackbody spectrum AND energy difference
A photon that is generated by either:
- inner atomic electrons jumping orbits
- charged particles deaccelerating
