Physical Science Notes

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62 Terms

1
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produces by something that vibrates
Electromagtic waves
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No they do not
Do electromagnetic waves require a medium?
3
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changing electric and magnetic fields
What are waves made out of?
4
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perpendicular
Are electric and magnetic fields perpendicular or parallel?
5
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the speed of light
What is the speed of an electromagnetic wave called?
6
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slower
Do electromagnetic waves travel faster or slower in solids?
7
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faster
Do electromagnetic waves travel faster or slower in gases?
8
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distance between crests
What is wavelength?
9
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the number of waves that pass a given point per second (Hz - Hertz)
What is frequency?
10
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changed particles that are always moving
What does all matter have?
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shorter
If the temperature of a material increases does the wavelength become shorter or longer?
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a piece of matter
particle
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discovered he could create a spark by shining a light
Heinrich Hertz
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discovered a wave can behave as a particle
Albert Einstein
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A massless bundle of energy that behaves like a particle
Photon
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the frequency of a wave
what does a photon depend on?
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travel in a wavy pattern
DO NOT..?
18
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exhibit the waves property of interference
DO..?
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magnetic resonance imaging (cures illness)
What does MRI stand for?
20
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(!) EW used to broadcast radio and television
radio waves
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(2) EW is used in cooking, radar, telephone, and other signals
Microwaves
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(3) EW that transmits heat from the sun, fires, radiators
infrared waves
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heatfrom chimney, fire and night vision equipment
what are examples of infrared waves?
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(4) EW that makes things able to be seen
visible light
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color
what is the brains interpretation of what you see?
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White
what color is the outcome of the presense of all colors?
27
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(5) EW absorbed by the skin, used in fluorescent tubes
ultraviolet waves
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Vitamin D, Disinfect, and Fluorescense
How can ultraviolet waves be useful?
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UVA, UVB, UVC rays
How can a ultaviolet waves be harmful
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(bone + teeth)
Vitamin D
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food, water, med supplies
Disinfect
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used to reveal fingerprints
Fluorescent
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long wl, skin cancer, wrinkling
UVA ray
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short wl, sunburn, skin cancer
UVB ray
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blocked by atmosphere
UVC ray
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(6) EW used to view inside of bodies and objects
x-rays
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Doctors, Dentists, and TSA's
Who uses x-rays?
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(7) EW used in medicine for killing cancer cells
gamma rays
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Yes it does
if there is high frequency does the energy in photons increase?
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cancer treatment
what are gamma rays used for?
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the process by which cancer spreads from 1 body part to another
Metastasize
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the use of drugs to treat kill cancer cells
chemotherapy
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the use of x-rays and gamma rays to kill cancer cells
radiation therapy
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Chemotherapy uses drugs to kill cancer cells while radiation therapy uses high energy beams (x-ray/gamma rays) to kill cancer cells
What is the difference between radiation therapy and chemotherapy?
45
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the specific frequency of the electromagnetic wave that a radio station is assigned
carrier wave
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adding signal waves and carrier waves
Modulation
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amplitude modulation (visual)
what is AM?
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frequency modulation (audio)
What is FM?
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a transceiver
what is a cellphone?
50
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converted from an electric signal to a radio wave by using an antenna
what is a modified carrier wave?
51
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electric signal causes the electrons to vibrate which makes the antenna vibrate
what causes a antenna to vibrate?
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outward
what direction do EW travel when the antenna vibrates?
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Electric signals whose values change smoothly over time
Analog Signal
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on/off
what are the analog signal's 2 values?
55
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digital signal
what kind of signals did tv stations start using to broadcast in 2009?
56
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radio signal
What does a pager transmit?
57
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doctors and resturants
who uses pagers?
58
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Global Positioning System. A system that determines one's exact location on Earth.
What is GPS?
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24
how many satilites are there?
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navigation and pets (chip)
How do we use GPS?
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U.S department if defense
what is it owned by?
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Radio Detection and Ranging
What does RADAR mean?