electrons and the electromagnetic
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ELECTRONS AND THE ELECTROMAGNETIC. S P E C T R U M. Electromagnetic Spectrum. EM Radiation Travels in Waves. Wave Characteristics WAVELENGTH – the distance between two consecutive wave peaks ; symbolized by the Greek letter lambda ( λ ) FREQUENCY – indicates how many wave

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Presentation Transcript
em radiation travels in waves
EM Radiation Travels in Waves
  • Wave Characteristics
  • WAVELENGTH – the distance between two

consecutive wave peaks; symbolized by

the Greek letter lambda (λ)

  • FREQUENCY – indicates how many wave

peakspass a certain point at a given

time; symbolized by the Greek letter nu (ѵ)

em radiation travels in waves1
EM Radiation Travels in Waves
  • Wave Characteristics
  • AMPLITUDE– height from originto

crest or origin to trough.

  • SPEED – ALLwaves travel at a speed

of 3.00 x 108m/s

light has properties of both waves particles
Light has properties of both waves & particles.
  • Max Planck – matter can gain or lose energy only

in a small, specificamount called a quantum.

  • Albert Einstein - light is made up of a stream of

tiny particles called photons.

  • A photon carries a quantum (a discreet amount)

of energy.

wave terminology and units
Wave Terminology and Units
  • C  the speed of light is 3.00 x 108 m/s
      • λ (lambda), the wavelength is normally given in the SI units of m, cm or nm
  • Ѵ (nu), the frequency of a wave is measured by counting the number of waves that pass a certain point per second. The SI unit for frequency is one hertz which is written 1/s or s-1
putting it together
Putting it Together
  • The speed of light is equal to the frequency of

the wavemultiplied by its wavelength.

  • c = λѵ
  • We can rearrange the equation if we are trying

to find wavelength or frequency.

λ= c/ѵ or ѵ= c/ λ

practice
Practice
  • What is the wavelength of a microwave having a frequency of 3.44 x 109 Hz?
  • We are looking for wavelength so we will use λ= c/ѵ
  • λ= 3.00 x 108m/s

3.44 x 109Hz

answers
Answers
  • λ= .872 X 10 -1 m or 8.72 X 10 -2 m
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