The electromagnetic spectrum
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The Electromagnetic Spectrum. Behavior of Light. All light travels at the same speed Behaves as a particle (photon) Behaves as a wave: travels through space. Wavelength and Frequency. Wavelength : The difference between 2 crests or 2 troughs of a wave

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The Electromagnetic Spectrum

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The electromagnetic spectrum

The Electromagnetic Spectrum


Behavior of light

Behavior of Light

  • All light travels at the same speed

  • Behaves as a particle (photon)

  • Behaves as a wave: travels through space


Wavelength and frequency

Wavelength and Frequency

  • Wavelength: The difference between 2 crests or 2 troughs of a wave

  • Frequency: The number of wavelengths that pass a certain point in one second


Wavelength and frequency1

Wavelength(λ) and Frequency (ƒ)

  • As the wavelength increases (gets longer), the frequency decreases (gets shorter)

  • The higher the frequency, the more energy the light wave has


Wavelength and frequency f

Wavelength (λ) and Frequency (f)


Wavelength and frequency f1

Wavelength (λ) and Frequency (f)

  • Longest wavelength?

    • Radio Waves

  • Shortest wavelength?

    • Gamma Rays

  • Lowest frequency?

    • Radio Waves

  • Highest frequency?

    • Gamma Rays

  • As the frequency of light increases, the wavelength decreases


Spectrograph

Spectrograph

  • An instrument that separates incoming light into a spectrum based on wavelength and frequency

  • Tells scientists:

    • What elements it is made of

    • Its temperature

    • Its density

    • The direction it is moving

    • Its magnetic field strength

    • How it has changed over time

http://www.learner.org/teacherslab/science/light/color/spectra/


Emission lines

Emission Lines

  • Hydrogen

  • Helium

  • Carbon


Doppler effect

Doppler Effect

  • The change in the frequency of a wave that is emitted by an object in motion


Red shift

Red Shift

  • A shift in the light spectra of objects towards the red end

  • The object is moving away from the observer


Blue shift

Blue Shift

  • A shift in the light spectra of objects towards the blue end

  • The object is moving closer to the observer


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