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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ELECTRONS AND THE ELECTROMAGNETIC

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Electrons and the electromagnetic

ELECTRONS AND THE ELECTROMAGNETIC

SPECTRUM


Electromagnetic spectrum

Electromagnetic Spectrum


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


Wave characteristics

Wave Characteristics


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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