LM9-10 Flashcards
Failures of Classical Physics (2)
Emission spectra of hydrogen, photoelectric effect
Wave-particle Duality
Light exhibits properties of both wave physics and particle physics
Rydberg Equation
Used to determine wavelength of photon absorbed/emitted when electron is being ionized
What does nl represent in the Rydberg equation
Final energy level (lower)
What does nh represent in the Rydberg equation
Initial energy level (higher)
Increasing frequency of a light hitting a metal does what to the ejected electrons?
Increases the speed at which they eject (kinetic energy)
Increasing intensity of a light hitting a metal does what to the ejected electrons?
Increases the amount of electrons ejected
Work function
Minimum quantity of energy required to remove an electron
Photoelectric Effect
Use of a photon to produce an electron
Kinetic energy of ejected electron equation simplified
KE = Energy of light - work function
deBroglie equation for wave-particle duality of matter
Wavelength = planck’s constant / momentum
How are wavelength and mass related?
Inverse relationship
Electrons generate wavelengths in what unit?
Nanometers
Protons generate wavelengths in what unit?
Picometers
A 1g marble generates wavelengths in what unit?
10^-31 meters
What experiment proved deBroglie’s theory?
Electron diffraction from electrons scattered by crystals
Uncertainty principle
The inability to precisely pinpoint the location of an electron because it behaves like a wave
Schrodinger’s solution to uncertainty principle
Use quantum mechanics to find the probability of where an electron is
Quantum number n
Energy levels, distance of electrons from nucleus
n correlates with what property of periodic table?
Period (energy level)
Quantum number l
Angular momentum, shape of electron’s atomic orbital
l correlates with what property of periodic table?
Blocks
Quantum number ml
Magnetic moment, explains orientation of atomic orbital
ml correlates with what property of periodic table?
Size of blocks in number of groups
Quantum number ms
Electron spin, orientation of electron’s spin in atomic orbital
Rydberg’s constant
3.3 x 10^15 Hz
To what kind of atoms does Rydberg’s equation apply?
To atoms with one electron
Modified Rydberg’s equation
Wavenumber = RZ^2((1/nl^2)-(1/nh^2))
Wavenumber
1/wavelength
