Physical Science Notes

produces by something that vibrates

Electromagtic waves

No they do not

Do electromagnetic waves require a medium?

changing electric and magnetic fields

What are waves made out of?

perpendicular

Are electric and magnetic fields perpendicular or parallel?

the speed of light

What is the speed of an electromagnetic wave called?

slower

Do electromagnetic waves travel faster or slower in solids?

faster

Do electromagnetic waves travel faster or slower in gases?

distance between crests

What is wavelength?

the number of waves that pass a given point per second (Hz - Hertz)

What is frequency?

changed particles that are always moving

What does all matter have?

shorter

If the temperature of a material increases does the wavelength become shorter or longer?

a piece of matter

particle

discovered he could create a spark by shining a light

Heinrich Hertz

discovered a wave can behave as a particle

Albert Einstein

A massless bundle of energy that behaves like a particle

Photon

the frequency of a wave

what does a photon depend on?

travel in a wavy pattern

DO NOT..?

exhibit the waves property of interference

DO..?

magnetic resonance imaging (cures illness)

What does MRI stand for?

(!) EW used to broadcast radio and television

radio waves

(2) EW is used in cooking, radar, telephone, and other signals

Microwaves

(3) EW that transmits heat from the sun, fires, radiators

infrared waves

heatfrom chimney, fire and night vision equipment

what are examples of infrared waves?

(4) EW that makes things able to be seen

visible light

color

what is the brains interpretation of what you see?

White

what color is the outcome of the presense of all colors?

(5) EW absorbed by the skin, used in fluorescent tubes

ultraviolet waves

Vitamin D, Disinfect, and Fluorescense

How can ultraviolet waves be useful?

UVA, UVB, UVC rays

How can a ultaviolet waves be harmful

(bone + teeth)

Vitamin D

food, water, med supplies

Disinfect

used to reveal fingerprints

Fluorescent

long wl, skin cancer, wrinkling

UVA ray

short wl, sunburn, skin cancer

UVB ray

blocked by atmosphere

UVC ray

(6) EW used to view inside of bodies and objects

x-rays

Doctors, Dentists, and TSA's

Who uses x-rays?

(7) EW used in medicine for killing cancer cells

gamma rays

Yes it does

if there is high frequency does the energy in photons increase?

cancer treatment

what are gamma rays used for?

the process by which cancer spreads from 1 body part to another

Metastasize

the use of drugs to treat kill cancer cells

chemotherapy

the use of x-rays and gamma rays to kill cancer cells

radiation therapy

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?

the specific frequency of the electromagnetic wave that a radio station is assigned

carrier wave

adding signal waves and carrier waves

Modulation

amplitude modulation (visual)

what is AM?

frequency modulation (audio)

What is FM?

a transceiver

what is a cellphone?

converted from an electric signal to a radio wave by using an antenna

what is a modified carrier wave?

electric signal causes the electrons to vibrate which makes the antenna vibrate

what causes a antenna to vibrate?

outward

what direction do EW travel when the antenna vibrates?

Electric signals whose values change smoothly over time

Analog Signal

on/off

what are the analog signal's 2 values?

digital signal

what kind of signals did tv stations start using to broadcast in 2009?

radio signal

What does a pager transmit?

doctors and resturants

who uses pagers?

Global Positioning System. A system that determines one's exact location on Earth.

What is GPS?

24

how many satilites are there?

navigation and pets (chip)

How do we use GPS?

U.S department if defense

what is it owned by?

Radio Detection and Ranging

What does RADAR mean?