unit 9
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| Which waves have some electrical properties and some magnetic properties | electromagnetic waves
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| Electromagnetic waves can transfer energy without a(n) Correct Answer | medium
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| Visible light has a higher frequency than | infrared rays
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| The range of electromagnetic waves placed in a certain order is called the | electromagnetic spectrum
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| The electromagnetic waves with the highest frequencies are called | gamma rays
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| Visible light can be separated into a spectrum of various | colors
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| If something vibrates one time per second, it has a frequency of | 1 hertz
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| FM signals travel as changes in | the frequency of the wave
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| What kind of waves do cellular telephones use to transmit and receive signals | microwaves
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| Which electromagnetic waves have the longest wavelengths and lowest frequencies | radio waves
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| On AM broadcasts, what modulates | the amplitude
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| Which of the following is true of ultraviolet rays | They help your body produce vitamin D
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| The speed of an electromagnetic wave is equal to | wavelength times frequency
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| Electromagnetic waves | are transverse waves
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| Electromagnetic radiation with the shortest wavelengths is | gamma rays
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| The electromagnetic waves with wavelengths slightly longer than visible light are | infrared waves
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| The frequency of purple light is ____ that of yellow light | higher than
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| are used for medical imaging | X rays
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| Gamma rays are dangerous because they | break down molecules and cells
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| Television uses ____ to transmit signals | radio waves
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| The part of the electromagnetic spectrum usually used for communication is | radio waves
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| In electromagnetic waves, the magnetic fields are ____________________ to the electric fields | perpendicular
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| The ____________________ rays in sunlight can cause sunburn | Ultraviolet
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| The part of the electromagnetic spectrum you can see is called ____________________ light | visible
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| The electromagnetic waves that have the lowest frequencies are called | radio waves
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| A thermogram identifies the warm and cool parts of an object by using | infrared rays
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| An electromagnetic wave consists of changing electric and magnetic | fields
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| The law of reflection states that the angle of ____________________ equals the angle of reflection |
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