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Lecture

Electromagnetism chem 110

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Department
Chemistry
Course
CHEM 110
Professor
Tomislav Friscic
Semester
Fall

Description
2: Electrons in atoms Electromagnetic  Radiation A  form  of  energy  transmission  in  which  electric  and  magnetic  ▯ields  are  propagated  as   waves  through  empty  space  (vacuum)  or  a  medium  (glass).   -­‐ Magnetic  ▯ield  component  lies  in  plane  perpendicular  to  electric  ▯ield  component -­‐ Produced  by  accelerating  an  electrically  charged  particle  (Maxwell) Wave A  disturbance  that  transmits  energy  through  space  or  medium. Characteristic  of  Waves Amplitude:  height  of  crest  or  trough Wavelength:  distance  between  crests  or  troughs  (m) Frequency:  number  of  crests  or  troughs  that  pass  through  a  give  point  over  time   (cycles/second  or  Hertz) -­‐  Velocity  =  wavelength  x  frequency -­‐ c  =  2.99792458  x  10^8m/s  (speed  of  light) Interference -­‐ In  phase:  constructive  interference  (crest  meets  crest  or  trough  meets  trough) -­‐ Out  of  phase:  destructive  interference  (crest  meets  trough) Diffraction Dispersion  of  different  wavelength  components  of    a  light  beam  through  the   interference  produced  by  re▯lection  from  a  grooved  surface Refraction -­‐ Speed  of  light  varies  in  speed  in  different  mediums.  Therefore,  it  is  refracted  (bent)   when  passes  from  one  to  another.   *Light  is  energy.  Studying  light-­‐matter  interactions  allows  energy  changes  to  be   detected.  More  controlled  than  heat.   Atomic  Spectra -­‐ continuous  spectrum:  diffracted  light  consists  of  many  wavelength  components -­‐ discontinuous  spectrum  (atomic  or  line  spectra):  small  number  of  wavelength   components   -­‐ production  of  line  spectrum: -­‐ light  source  is  lamp  containing  helium  gas -­‐ electric  dis
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