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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