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8 Science Ch 3

Sound and LIght - The Electromagnetic Spectrum

QuestionAnswer
Which light bulbs are coated on the inside with a powder? fluorescent
Visible light can be separated into various colors to form a... spectrum
About how much faster than sound are electromagnetic waves? one million times faster
FM signals travel as changes in ... the frequency of the wave
Which of the following is true of ultraviolet rays: they help your body produce vitamin D; they provide the energy that makes your morning toast They help your body produce vitamin D.
Global Positioning System signals can tell you... your exact location on Earth
In a vacuum, all electromagnetic waves have the same ... speed
Which type of light bulb is commonly used in advertising signs and decorations? neon
Electromagnetic waves can transfer energy without a ... medium
Cell phone signals are transmitted by... radio waves
Broadcasting stations can send their signals around the world using... television satellites
For each cell, or geographical area, a cellular phone system requires... a tower
Which type of light bulb glows when a filament inside it gets hot? incandescent
The electromagnetic waves with the highest frequencies are called... gamma rays
The Global Positioning System (GPA) was originally designed for use by... the military
Which electromagnetic waves have the longest wavelengths and lowest frequencies? radio waves
An instrument used to view different colors of light produced by each type of light bulb is called a... spectroscope
The speed of an electromagnetic wave is equal to... wavelength times frequency.
What kind of waves to cellular telephones use to transmit and receive signals? microwaves
The images made by an infrared camera are called... thermograms
On AM broadcasts, what remains constant? the frequency
What do cell phones require to work? a cellular system
A packet of light energy is called a... photon
When a police officer uses radar for speed control, the officer is using what kind of electromagnetic waves? radio waves
Light that has passed through a polarizing filter is called... polarized light
Which waves have some electrical properties and some magnetic properties electromagnetic waves
Visible light has a higher frequency than... infrared rays.
If something vibrates one million times per second, it ha a frequency of... 1 megahertz
What is transferred by electromagnetic waves? electromagnetic radiation
The range of electromagnetic wave placed in a certain order is called the.. electromagnetic spectrum
________ _______ carry information from a broadcasting station to your radio or television. radio waves
Thermograms are produced by _______. infrared rays
Cellular telephones transmit and receive signals using high-frequency __________. microwaves
In a sodium vapor light, neon or argon gas is heated until it causes sodium to change from a ________ into a gas. solid
Electromagnetic waves are classified as __________ waves. transverse
Electromagnetic waves that have wavelengths slighty shorter than those of visible light are called ______________. ultraviolet rays
Electromagnetic waves with the longest wavelengths have the ________ frequencies. lowest
_____________ make long-distance telephone calls possible anywhere in the world. satellite telephone systems
_________ light consists of waves that vibrate in one direction only. Polarized
Frequency modulation transmits signals by changing the __________ of the wave. frequency
Created by: 8thgraders
 

 



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