Date post: | 24-Dec-2015 |
Category: |
Documents |
Upload: | megan-robertson |
View: | 213 times |
Download: | 1 times |
Write what’s in white on the back of the Week 10 Concept Review
Then, answer the questions on the front
Your Job
The quantum mechanical model developed as a result of scientists trying to explain the behavior of light
Assumed it consisted of particles Discovered light actually consists of waves
by 1900
Light
Amplitude: wave’s height from zero to the crest
Wavelength: distance between crests
Frequency: # wave cycles to pass a given point per unit of time.
The product of frequency and wavelength always equals a constant, the speed of light
Light
How are wavelength and frequency related?
QUESTION
Electromagnetic radiation includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays
Sunlight consists of light with a continuous range of wavelengths and frequencies. When sunlight passes through a prism, the frequencies separate into a spectrum of colors.
Electromagnetic Spectrum
QUESTION What color in the visible spectrum has the longest wavelength?
http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Electromagnetic_Radiation
When atoms absorbs energy, electrons move into higher energy levels. These electrons then lose energy by emitting light when they return to lower energy levels.
Atomic emission spectrum: the frequencies of light emitted by an electron.
Is different for each element (like a fingerprint)
Ground State vs. Excited State Ground state; lowest possible energy an
electron can have Excited state: the level the electron jumps to.
Atomic Spectra
http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/linesp16.swf
The idea that electrons were described as waves and particles was difficult for scientists to accept.
Photon: a quantum of light; a discrete bundle of electromagnetic energy that interacts with matter similarly to particles.
Heisenberg Uncertainty principle: it’s impossible to know exactly both the velocity and the position of a particle at the same time.
Quantum Mechanics
Write the following words on small pieces of paper
Amplitude Wavelength Frequency Electromagnetic radiation Atomic emissions spectrum Ground state Photon Heisenberg uncertainty principle Quantum mechanical model Visible light
Quick Draw!!!
The fingerprint of an element. Discrete lines of electromagnetic waves (or color) that an excited atom gives off. Seen through a prism