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Electromagnetic Waves

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Electromagnetic energy is created by objects in outer space and by humans. Wave Properties All electromagnetic waves travel at the speed of light ... – PowerPoint PPT presentation

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Title: Electromagnetic Waves


1
Electromagnetic Waves
Chemistry
2
  • Electromagnetic energy is created by objects in
    outer space and by humans.

3
Wave Properties
  • All electromagnetic waves travel at the speed of
    light (3.00 x 108 meters/sec)
  • Some electromagnetic waves are invisible while
    others are visible.

4
Waves
  • Each wave consists of a crest and a trough.

5
Amplitude
  • The amplitude is the height measured from the
    midpoint to the top of the crest.

6
Wavelength ?
  • Wavelength is measured as a complete wave cycle.

7
Frequency ?
  • Frequency is the number of waves that pass a
    reference point in a given time. ? ?/s

8
Frequency
  • The unit for frequency, (cycles per second) is
    hertz. The radio station
  • Has a frequency of 95 megahertz. 95 X 106 hertz
    (Hz) is their broadcasting frequency.

95 triple x
9
Frequency and Wavelength
  • As frequency increases wavelength decreases.
  • F 1/w

10
Continuous Spectrum
  • Wavelength increases from left to right on this
    spectrum.
  • Visible light is measured in nanometers (nm) 1
    billionth of a meter (10-9)

11
What does this have to do with atoms?
  • When atoms get excited, 1) electrons jump up to
    higher energy levels momentarily, then 2)fall
    back to their lower energy level. When they fall,
    they lose energy and 3)the lost energy is
    released in the form of visible waves we see as
    color.

12
Different Element Emission Colors
  • Each element has its own spectrum depending on
    its electron configuration. Electrons that fall
    more energy levels tend to emit violet
    wavelengths. Electrons that only fall one or two
    levels tend to emit red
  • wavelengths.

13
Wave Effects
  • Waves can undergo reflection, refraction,
    diffraction, and polarization.

14
Wave Effect Examples
  • Reflection means they reflect or bounce off
    something else.
  • Refraction means they bend as they pass through
    something else.
  • Diffraction and polarization occur when the waves
    are separated into different wavelengths.

15
Element Spectra
  • http//jersey.uoregon.edu/vlab/elements/Elements.h
    tml
  • Each element has its own emission spectrum, based
    on its electrons.
  • When electrons are excited they 1) jump to higher
    E levels, 2) then fall back down, 3) releasing
    wave energy in specific wavelengths we see as
    color.

16
Waves
  • Hot
  • or Not?

17
Definitely HOT!
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