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RADIO WAVES

RADIO WAVES

• Longer wave > less penetrating abilities
• Travel at the speed of light
• Naturally occurring radio waves are made by lightning
• Artificially generated waves are used for fixed and mobile radio communication, communication satellites, broadcasting radar, and other navigation systems

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MICROWAVES

MICROWAVES

• Cause water and fat molecules to vibrate which makes the substance hot
• Shorter than radio waves > more penetrating abilities
• Used in microwave ovens to cook many types of food

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VISIBLE WAVES

VISIBLE WAVES

• Only electromagnetic waves you can see
• Short waves than microwaves > more penetrating abilities
• The color of an object that we see is the color of the light that is reflected
• All other colors are absorbed
• Sun - natural source
• Light bulb is artificial source

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ULTRAVIOLET WAVES

ULTRAVIOLET WAVES

• An electromagnetic radiation
• Shorter waves than visible light > more penetrating abilities
• Usually visible
• Present in sunlight
• Produced by electric arcs
• Long wavelength ultraviolet radiation can cause chemical reactions and cause many substances to glow

TANNING BEDS

• Emit ultraviolet radiation to produce a cosmetic tan
• Several fluorescent lamps that have phosphor blends designed to emit UV in a spectrum somewhat similar to the sun
• Uv rays can increase the risk of melanoma, cataracts, and premature skin aging

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X-RAYS

X-RAYS

• Very high frequency
• Carry a lot of energy
• Shorter wavelength than ultraviolet > more penetrating abilities
• Pass through most substances

DOCTORS OFFICE

• X-rays are used by doctors to see through patients
• Easily pass through tissue, cannot pass through bone
• Send a beam of x-rays through the patient & onto a piece of film, which goes dark where x-rays hit it
• Leaves white patches on the film where the bones were in the way

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GAMMA RAYS

GAMMA RAYS

• Packet of electromagnetic energy photon
• Gamma photons are the most energetic photons in the spectrum
• Shorter wavelength than x-rays > more penetrating abilities
• Emitted from the nucleus of some unstable atoms
• Used to make lasers that cut through most material