Lecture 5 Flashcards
Learning objectives
-Electromagnetic radiation
-Calculations EMR
-understand paradoxes of the structure of the atom
-understand the Bohr model and calculate electron between quantum levels
-understand paradoxes of
Wavelength
The distance between two consecutive peaks or troughs
Frequency
Frequency number of wave cycles that pass a specified point in space on a specified time
Electromagnetic Spectrum
Increasing energy to the left and increasing frequency, increasing wavelength to the right
Paradoxes and Failures of Classical models
Photoelectric effect
Photoelectric Effect
Matter to matter interacts, light shining on the table doesn’t interact the same however matter interacts with waves and waves interact with matter. (E=hv) wave particle duality
The Bohr Model
Lambda = h/mv this is used if a particle would convert to a wave what would it be for its wavelength. For any particle in Motion behaving like a wave.
Why don’t large objects become waves?
Large substances have unfathomably low wavelengths
Line Spectra
Discrete bands vs a continuum
Bohr model
Is in layers like an onion…. :D discrete levels
Quantum Nucleus
Elections have kinetic energy in ‘motion’ (want to move away). Nucleus keeps electrons orbiting. Electrons transfer between quantum levels (shells).
Max Planks Expression
Energy is released or absorbed in discreet packets
Energy is therefore quantized
The discrete packets of energy are called photons
Energy of ‘ n’photons E=n.h.v
E=(n)h.v
Planks Constant
Excited and Ground Electronic States
Baller Rydberg Equation
1/lymb =R(1/2 -/
Uncertainty Principle
Quantum Mechanical Model
A ‘e’ viewed as a wave circling around the nucleus.
