Chapter 11 - Electromagnetic Waves Flashcards
consists of a vibrating electric field and a vibrating magnetic field
Electromagnetic Wave
Electromagnetic wave carry ________ ________?
Radiant Energy
How fast do electromagnetic waves travel?
300,000 km/s
Electromagnetic waves travel more _______ in matter
Slowly
The speed of an electromagnetic wave depends on…?
The material
Electromagnetic waves can behave as particles called…?
Photons
Electromagnetic waves with wavelengths longer than 10cm
Radiowave
Electromagnetic waves with wavelengths between 0.1 mm and 30 cm.
Microwave
Electromagnetic waves with wavelengths between one thousandth of a meter and 700-billionth of a meter.
Infrared Wave
The range of electromagnetic waves that you detect with your eyes.
Visible Light
Electromagnetic waves with wavelengths from 400-billionths to 10-billionths of a meter
Ultraviolet Wave
UV waves can enter _____
Cells
Electromagnetic waves from 10-billionth to 10-trillionth of a meter
X-ray
X-rays have _____ wavelengths than UV rays
Shorter
Electromagnetic waves with wavelengths shorter than 100-trillionth of a meter
Gamma Ray
Produced by processes that occur in the nuclei of atoms
Gamma Rays
The range of frequencies of electromagnetic waves is called…?
The electromagnetic spectrum
______ and _______ have the longest wavelength.
Radiowaves, Microwaves
All objects emit __________
Infrared Waves
The human eye can detect ________ ______
Visible Light
____, ______, and _____ are both helpful and harmful to humans.
Ultraviolet rays, X-rays, and Gamma rays
An electromagnetic wave with the specific frequency that a station is assigned
Carrier Wave
The process of adding an information signal to a carrier wave.
Modulation
Electric signals whose values change smoothly overtime
Analog Signal
electric signal for which there are only two possible values (On and Off)
Digital Signal
Transmits one radio signal and recieves another radio signal
Transceiver
Telephones contain transceivers and convert _______ into _______ and _______ into _______
sounds waves, electic signals, electirc signals, sound waves
Microwave towers and satellites are used to ___ ____ ____.
Transmit telephone signals
Uses a system on satellites to determine one’s exact position.
Global Positioning System (GPS)
R.A.D.A.R stands for?
RAdio Detecting And Ranging