Electromagnetic waves
Electromagnetic waves are made by vibrating _______ ________.
What are electric charges?
These make up the entire range of electromagnetic wave frequencies.
What is the electromagnetic spectrum?
These waves are used for communications and medical imaging.
What are radio waves?
This is an electromagnetic wave with the specific frequency that a station is assigned.
What is a carrier wave?
This transmits one radio signal and receives another radio signal.
What is a transceiver?
Electromagnetic waves are composed of changing __________ and ________ fields.
What are electric and magnetic?
These waves are the longest being longer than 10 cm.
What are radio waves?
These interact with water molecules in food to heat it up.
What are microwaves?
This is the process of adding a signal wave to the carrier wave.
What is modulation?
This is an example of a transceiver.
What is a: telephone, pager or satellite?
This is the way we measure the speed of electromagnetic waves.
What is the speed of light?
This is a way to find the position and movement of objects.
What is radar?
This is a range of electromagnetic waves you can detect with your eyes.
What is visible light?
These are the two ways to modulate carrier waves.
What are AM and FM radio?
Electric signals whose values change smoothly over time are called _____________, and one where there is only two possible values: on or off is ___________.
What are analog and digital signals?
This is the fastest rate anything can travel.
What is the speed of light?
Every object emits these waves, and the hotter the object the more it emits.
What are infrared waves?
These can be helpful and harmful to the human body. The Ozone layer helps protect us from the bad ones.
What are ultraviolet waves?
AM radio stands for this.
What is amplitude modulation?
These mobile telephones can be used where no towers are located; like in the middle of the ocean.
What are satellite telephones?
In matter, electromagnetic waves are slowest through _________ and faster in _________.
What are solids and gases?
These waves have the highest frequencies and highest-energy photons.
What are gamma rays?
Give an example of how UV rays are helpful. Give another example of ways they are harmful.
What are: disinfect food, medical equipment, help body make vitamin D?
What are: sunburn, skin cancers, wrinkles?
The modified carrier wave is converted from an electric signal to a radio wave by using this item.
What is an antenna?
This is a system of satellites, ground monitoring stations and receivers that determine your exact location at or above Earth's surface.
What is Global Positioning System (GPS)?