The ____________________ rays in sunlight can cause sunburn
ultraviolet
100
An electromagnetic wave consists of changing electric and magnetic ____________________.
fields
100
The part of the electromagnetic spectrum you can see is called ____________________ light.
visible
100
As an electric ____________________ passes through the gas in a neon light, gas particles absorb energy.
current
100
AM signals travel as changes in the ____________________ of a radio wave.
amplitude
200
What kind of waves do cellular telephones use to transmit and receive signals?
microwaves
200
In the phenomenon known as the ____________________ effect, electric current will flow when light shines on certain substances.
photoelectric
200
The electromagnetic waves that have the lowest frequencies are called ____________________.
radio waves
200
Red light has the longest ____________________ of any color of visible light.
wavelength
200
____________________ satellites are satellites orbiting Earth that receive radio, television, and telephone signals and then transmit them around the world.
Communications
300
A thermogram identifies the warm and cool parts of an object by using ____________________.
infrared rays
300
Energy that is transferred by electromagnetic waves is called electromagnetic ____________________.
radiation
300
The ____________________ rays in sunlight can cause sunburn.
ultraviolet
300
Visible light can be separated into various colors to form a(n)
spectrum
300
A cellular system works by dividing regions into small ____________________, or geographical areas.
cells
400
An instrument used to view different colors of light produced by each type of light bulb is called a(n)
spectroscope
400
The speed of an electromagnetic wave is equal to
wavelength times frequency
400
____________________ are used to make images of bones inside the human body.
X-rays
400
Which type of light bulb glows when a filament inside it gets hot?
incandescent
400
The Global Positioning System (GPS) was originally designed for use by
the military
500
A packet of light energy is called a
photon.
500
About how much faster than sound are electromagnetic waves?
one million times faster
500
The electromagnetic waves with the highest frequencies are called
gamma rays
500
Which light bulbs are coated on the inside with a powder?