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unit 9

QuestionAnswer
Which waves have some electrical properties and some magnetic properties electromagnetic waves
Electromagnetic waves can transfer energy without a(n) Correct Answer medium
Visible light has a higher frequency than infrared rays
The range of electromagnetic waves placed in a certain order is called the electromagnetic spectrum
The electromagnetic waves with the highest frequencies are called gamma rays
Visible light can be separated into a spectrum of various colors
If something vibrates one time per second, it has a frequency of 1 hertz
FM signals travel as changes in the frequency of the wave
What kind of waves do cellular telephones use to transmit and receive signals microwaves
Which electromagnetic waves have the longest wavelengths and lowest frequencies radio waves
On AM broadcasts, what modulates the amplitude
Which of the following is true of ultraviolet rays They help your body produce vitamin D
The speed of an electromagnetic wave is equal to wavelength times frequency
Electromagnetic waves are transverse waves
Electromagnetic radiation with the shortest wavelengths is gamma rays
The electromagnetic waves with wavelengths slightly longer than visible light are infrared waves
The frequency of purple light is ____ that of yellow light higher than
are used for medical imaging X rays
Gamma rays are dangerous because they break down molecules and cells
Television uses ____ to transmit signals radio waves
The part of the electromagnetic spectrum usually used for communication is radio waves
In electromagnetic waves, the magnetic fields are ____________________ to the electric fields perpendicular
The ____________________ rays in sunlight can cause sunburn Ultraviolet
The part of the electromagnetic spectrum you can see is called ____________________ light visible
The electromagnetic waves that have the lowest frequencies are called radio waves
A thermogram identifies the warm and cool parts of an object by using infrared rays
An electromagnetic wave consists of changing electric and magnetic fields
The law of reflection states that the angle of ____________________ equals the angle of reflection
Created by: s730338
 

 



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