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Electromagnetic Spectrum
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What are some differences you notice about these images
What are some differences you notice about these images? Why would having these different images be important to the study of the universe?
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Light Light Energy - Energy that travels in the form of waves.
Example: Sunlight
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Light Light - a transfer of energy that creates a visual sensation
Light is a transverse wave
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Light Light does not need a medium to travel
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Light Frequency - the number of waves passing a point per second
Units: Hertz (Hz) Frequency describes the color/type of light HIGH frequency = Ex. UV Light Waves LOW frequency = Ex. Radio Waves
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Light Let’s look at the relationship between wavelength, frequency, and energy, as it applies to waves.
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Light Light belongs to a larger category of waves called the electromagnetic spectrum. Electromagnetic spectrum - the full range of visible and invisible waves.
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What is the Electromagnetic Spectrum?
Professor Dave Explains...
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Light The electromagnetic spectrum includes:
Radio waves Microwaves Infrared waves (IR) Visible light Ultraviolet waves (UV) X-Rays Gamma rays All waves travel 300,000 km/s = SPEED OF LIGHT
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Electromagnetic Spectrum
Visible Light Radio Microwaves Infrared (IR) Ultraviolet (UV) X-Ray Gamma LONG Wavelength Frequency Energy SHORT Wavelength Frequency Energy LOW HIGH R V O I LOW Y G B HIGH
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Electromagnetic Spectrum
Radio Waves - longest wavelength and lowest frequency and energy used in radio and TV, microwave ovens, and radar. Cell phones
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Electromagnetic Spectrum
Microwaves - slightly shorter wavelength than radio, slightly higher frequency/energy Cooking and reheating food
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Electromagnetic Spectrum
Infrared Light (IR) - source of heat and used to discover heat differences Warming lamps Thermograms
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Electromagnetic Spectrum
Visible Light - only light visible to humans Color (ROYGBIV)
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Electromagnetic Spectrum
Ultraviolet Light - higher frequency than violet Sunlight (source of Vitamin D) Excessive exposure damages skin Can disinfect air/bacteria
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Electromagnetic Spectrum
X-Rays - makes pictures of the inside of solid objects X-Ray technology
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Electromagnetic Spectrum
Gamma Rays - high energy waves with the greatest penetrating ability of all waves. Radiation therapy
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