FAIR USE STATEMENT :
15
FAIR USE STATEMENT: Please feel free to edit and use this presentation in your classroom. Please do not remove the credit line on the title page or republish the file in whole or in part as your own. Please do not distribute the file to individuals or at conferences or workshops. I am more than willing to share the presentation with anyone that contacts me at [email protected] . The images used in the presentation are not original and the presentation is distributed freely but only for classroom instruction. Rhonda Alexander
-
Upload
bernard-ross -
Category
Documents
-
view
18 -
download
4
description
FAIR USE STATEMENT : - PowerPoint PPT Presentation
Transcript of FAIR USE STATEMENT :
FAIR USE STATEMENT: Please feel free to edit and use this presentation in your
classroom. Please do not remove the credit line on the title page or republish the file in whole or in part as your own. Please do not distribute the file to individuals or at conferences or workshops. I am more than willing to share the presentation with anyone that contacts me at [email protected]. The images used in the presentation are not original and the presentation is distributed freely but only for classroom instruction.
Rhonda Alexander
ELECTROMAGNETIC RADIATION
gammaX-ray
Ultraviolet visible
infraredmicro
radio
Planck
Einstein
de Brogelie
Curie
Is a type of energy form that Exhibits wavelike behaviorAs it travels through space
Electromagnetic Radiation
Ground State = Lowest energy level
Excited State = High energy level
wave
Characteristics Crest
Trough
Electromagnetic Spectrum - is all the forms of electromagnetic radiation put together.
Slide 17
WavelengthDistance between two peaks or troughslambda
FrequencyNumber of waves per secondnu
Speed of light, c3.0 X 108 m/s
λ
ν
Electromagnetic Calculations
• E=energy (Joules, J)
• c=speed of light 3.0*108m/s
• h=Plank’s Constant 6.626*10-34Js=frequency (1/s or Hertz, Hz)=wavelength (m)
E=h
c=
Speed of light = (Wavelength)(Frequency)The brilliant red colors seen in fireworks are due to the emission of light with wavelength around 650 nm when strontium salts are heated. Calculate the frequency of red light.
1 m= 109 nm or 10-9m = 1nm
=650nm = 650*10-9 mc=3.0*108 m/s
c==c/3.0*108m/s/ 650*10-9 m.62*1014 1/s
Energy is quantized
Energy is gained or lost in whole number ratios
E= h h=6.626 X 10-34 J . s
Calculate the smallest increment of energy than an object can absorb from yellow light whose wavelength is 589 nm.
=589nm = 589*10-9 mc=3.0*108 m/s
c==c/3.0*108 m/s/ 589*10-9 m*1014 1/s
h=6.626*10-34 Js*1014 1/sE=hE=(6.626*10-34 Js)(*1014 1/s)E=3.37*10-19J
Types of Spectra
All the colors of the rainbow
Only certain colors dependson electron motion
