Ch. 6 Flashcards
Wavelength
the distance between corresponding points on adjacent waves is the wavelength.
Frequency
the number of waves passing a given point per unit of time
ratio of wavelength to frequency
the longer the wavelength the smaller the frequency and vice versa.
Electromagnetic radiation travels at:
the same velocity
speed of light constant (c)
3.00 x 10^8 m/s
equation for electromagnetic radiation
C = λv
how did Max Planck describe energy;
in terms of quanta
quantum
when energy is divided into discreet steps
equation of quantum (energy of a photon)
E = hv
Planck’s constant
6.626 x 10^-34 J-s
if the wavelength of light is known you can calculate?:
the energy in one photon
Electorons can only occupy
certain orbitals
Electrons in permitted orbits
have specific:
“allowed”energies;
these energies will not be radiated from the atom
Energy is only absorbed or emitted in such a way as to:
move an electron from one “allowed” energy state to another
The equation for electron promotion or absorbtion
E = −hcRH (1/nf2 – 1/ni2) RH = 1.097 x 10^7 /m
Equation for the relationship between mass and wavelength
λ = h/mv v = velocity
photoelectric effect
the emission of electrons from a metal surface induced by light
Photon
a particle of energy
Spectrum
the distribution among various wavelengths of the radiant energy emitted or absorbed by an object
Continuous spectrum
a spectrum that contains radiation distributed over all wavelengths
line spectrum
a spectrum containing radiation of only specific wavelengths
momentum
mv = mass * velocity
matter waves
the wave characteristics of a moving particle
uncertainty principle
it is impossible to know simultaneously both the exact momentum of the electron and its exact location in space
uncertainty equation
Δx * Δ(mv) ≥ h/4∏
standing waves
waves that do not travel in space
nodes
point where the amplitude of the wave is 0
wave functions
describe the electron in an atom
