Emission Spectra, Heisenberg Uncertainty, Photoelectric Effect

is unique for each individual element, it’s a spectrum (colors) of frequencies emitted as an atom goes from high to low energy states. It’s like an element’s fingerprint which can be used to ID an element.

spectrophotometer

Ephoton =hf = hc/lambda - lambda is upside down y thing

• f= the photon’s frequency (this can be different for different photons) • c= speed of light, which is 3.0x10^8m/s • h=Planck’s constant, which is 6.63x10^34J*s • lambda= the phtons wavelength

3.0x10^8 m/s Represented by the letter “c”

frequency

wavelength (lambda)

It is impossible to determine a subatomic particle’s position and its momentum with perfect accuracy

One does not simultaneously determine both the position and momentum of an electron, the more you know the location- the less you know its momentum

If you shine enough energy at a metal plate, it causes the metal plate to eject electrons -this is how solar panels work (photons from the sun have high enough energy to cause metal plates to eject electrons)

Flow of e-

1) metal has to be hit with a photon with enough energy. Therefore, the photon must have high frequency and low wavelengths (Ephoton equation) 2) Kinetic energy of an e- must be greater than zero

Kenetic energy of e- = Ephoton - phi (work function)

the minimum amount of energy required to ionize (excite) the electron