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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