Card Set Information
Symbol for frequency?
Symbol for wavelength?
Speed of light?
3.00 x 10
Relationship between wavelength and frequency?
c = (wavelength)(frequency)
EM Radiation Experiments? (hint: 3)
- Blackbody Radiation
- Photoelectric Effect
- Emmission Spectrum of gases
~ EM Radiation comes from objects that have been heated
~ high frequency, (short wavelength) has a high energy
- the inverse is also true -
Planck's Constant (h)
6.626 x 10
tiny packets of light, photons, have own unique energy
photons behave like particles and like waves (duality)
Emission Spectrum of Gases?
Excited atoms emit light at discrete wavelengths
every atom gives unique emission spectrum
E = hc/lambda
principle quantum number
"orbits" of specific size where the energy of the electrons depends on
lower n = lower E and the orbit is closer to the nucleus
what causes the "lines" in emission spectra?
When an electron falls back to the ground state from an excited state the E emitted as a quantum of light, or photon.
this photon represents the "lines".
The amount of E absorbed or emitted in promoting or demoting electrons within allowed n levels
Change in E = E
) - (-R
= 2.18 x 10
Based on the equation, if the change in E is less than 0 and E is given off this is an
Based on the equation, if the change in E is greater than 0 and E is absorbed this is an
Based on the equation, if the final energy level is infinity, the electron has been removed completely
What is the relationship between mass and wavelength?
wavelength = h/mass x velocity
Heisenberg's Uncertainty Principle
uncertainty in position
energy (or momentum)
is greater than or equal to
the mathematical equation that describes the electrons
Angular Momentum Quantum Number (l)
defines the shape of the orbital
range from 0 to n-1
we use letter designations in place of l