Term
Describe the phenomenon of black body radiation 

Definition
As an object is heated there is a shift from red>white>Blue as e/m goes from low frequencies to high frequencies 


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Explain what is meant by ultraviolet catastrophe 

Definition
a prediction by RayleighJeans Law that as temp increase the radiant energy density should diverge at ν^2 and enter the uv region 


Term
Explain the relevance of the RayleighJeans law 

Definition
a classical physics approach at relating intensity and frequency of blackbody radiation to temp 


Term
Explain the assumption Planck made to derive the distribution law 

Definition
Assumption was that the energy oscillators where discrete and proportional to an integer multiple of frequency Enhν. This hold true for all Temp and ν if h=Planck's constant 


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Describe the agreement btwn the Planck distribution law and experimental data of blackbody radiation 

Definition
Planck's distribution for black body radiation was in agreement w/ experimental data at all temps and ν if h = Planck's constant 


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Definition


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Definition
Planck's distribution Law 


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Definition


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Definition
the alt Wein displacement law 


Term
Describe what what wein's displacement says 

Definition
Relates the max wavelength from an e/m distribution emitted from a black body to temperature 


Term
How does weins law provide evidence for plancks law? 

Definition
Provides an empirical relation to plancks law for temp and wavelength if h=plancks constant 


Term
How was Planck's law view by his contemporaries 

Definition
They believed his assumption was an arbitrary deviation and that there should be something that obeyed classical physics 


Term
What was the Significance of Planck's assumption to quantum mech 

Definition


Term
Describe the photo electric effect 

Definition
Is the ejection of an electron from the surface of a metal by a photon that has a frequency exceeding the threshold frequency of the metals work function 


Term
What are the 3 experimental observations for the photoelectric effect 

Definition
1)KE of ejected electron is independent of radiation intensity 2)There is a min threshold frequency need to eject an electron 3)Above threshold frequency, electron KE varies linearly 


Term
Define threshold frequency 

Definition
min frequency required to eject electron from surface of metal 


Term
Define threshold wavelength 

Definition
min wavelength required to eject electron from surface of metal 


Term

Definition
Analogous to ionization energy. Min amount of energy required by photon to eject electron 


Term
Describe Einstein’s explanation of the photoelectric effect 

Definition
Radiation exists in small packets of energy called photons. The KE of ejected electron is equal to the energy of the photon minus the min energy to remove electron 


Term
Identify Einstein's key equation 

Definition


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Explain how the value of Planck’s constant from photoelectric effect experiments compared to the value of Planck’s constant from blackbody radiation experiments 

Definition
The value of Planck's constant in both cases equaled that of Planck's constant from blackbody radiation. 


Term
Explain the significance of plancks constant to the development of quantum mechanics. 

Definition
Determined energy was quantized, which was significat to the development of quantum mech 


Term
Qualitatively describe the appearance of hydrogen emission spectra and how they are obtained. 

Definition
Subjecting hydrogen to high temp or electric discharge causes each atom to emit electromagnetic radiation of characteristic frequencies 


Term
Explain what a line “series” is in an emission spectrum 

Definition
The lines in an emission spectrum consist of only discrete frequencies. 


Term
how are the lines in a series emission spectra related? 

Definition
The lines in each series are related by an n quantum # that an excited eclecton relaxes to 


Term
how are the lines in different series emission spectra different? 

Definition
The difference for each series is what quantum state the electron relaxes to. Lymann n=1 Balmer n=2 Paschen n=3 Brackett n=4 


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Definition


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State the Ritz combination rule 

Definition
Stater that all observed spectra lines for all atoms can be expressed as a difference of terms 


Term
Describe what is meant by “the waveparticle duality of light”. 

Definition
Mean that a photon of light has both wave properties (ex. diffraction) and particle properties (ex. photoelectric effect) 


Term
Describe de Broglie’s idea about waveparticle duality and matter. 

Definition
de Broglie postulated that if light had wave particle properties, matter should also exhibit waveparticle duality 


Term
Describe the classical diffraction pattern exhibited by xrays and electrons and how it relates to the concept of waveparticle duality. 

Definition
Electrons exhibit a wavelength similar to that of xrays. In both instances, when the wave interacts w/ an atom in a lattice, the wave front propagate around it exhibiting the same light and dark interference patterns. this experiment demonstrates the wave nature of electrons 


Term
Identify the de Broglie equation. 

Definition


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Define the de Broglie wavelength. 

Definition
The de Broglie wavelength is equal to planck's constant divided by the momentum of a particle 


Term
Describe the Bohr model of the atom 

Definition
Is the theory that explains the hydrogen atomic spectrum 


Term
Identify the two forces on the electron that are in balance 

Definition
Coulomb force and centripetal force 


Term
State Bohr’s two nonclassical assumptions. 

Definition
1) There are stationary electron orbitals 2) The de Broglie wave of an electron must be in phase after a complete revolution 


Term
Define “groundstate energy” 

Definition
The lowest energy electron configuration of an atom 


Term

Definition
An electron configuration of an atom other than the lowest energy state 


Term
Explain how the energy states are considered “bound states 

Definition
The electron is bound in the atom and in order to get an electron from n=1 to n=infinity requires energy 


Term
Draw the transition of the different hydrogen emission series on the energy level diagram 

Definition


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Definition
the equation for the radius of the bohr orbit 


Term

Definition
the equation for energy of electron 


Term
Describe the problem encountered in trying to measure the position of an electron with light. 

Definition
The photon used to locate the electron imparts a momentum to the electron while locating it. As a result, you know the location of the electron w/ in the width of the photons wavelength, but you introduced an uncertainty in the momentum 


Term
Identify Uncertainty principle equations 

Definition

