Physical Science - Chapter 21
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39 Terms
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Visible light
electromagnetic waves that humans can see.
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Photon
a wave bundle, or particle, of electromagnetic energy.
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Microwave
a wave from the upper end of the radio wave band.
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Gamma ray
a high- energy photon that is emitted from a nucleus when a radioactive isotope experiences gamma decay.
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Ultraviolet wave
an electromagnet wave that is just beyond (more energetic than) violet visible light.
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X ray
photograph taken with ________.
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Amplitude modulation
the process of putting information into a radio wave by changing, or modulating, the amplitude of the wave.
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Frequency modulation
the process of putting information into a radio wave by changing, or modulating, the frequency of the wave.
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electromagnetic wave
a disruption in an electromagnet field that carries energy, even through the vacuum of space
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photon
a wave bundle, or particle, of electromagnetic energy
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electromagnetic spectrum
the entire range of all electromagnetic wave s
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Radio wave
the longest and lowest energy type of electromagnet wave
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Frequency
3 Hz to 300 GHz
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Wavelengths
100 000 km to 1 mm
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Uses
navigation, communication
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Microwave
a wave from the upper end of the radio wave band
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Frequency
300 MHz to 300 GHz
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Wavelengths
1 m to 1 mm
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Uses
navigation, communication, astronomy, cooking
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Visible light
electromagnetic waves that humans can see
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Frequency
430 THz to 790 THz
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Wavelengths
700 nm to 380 nm
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Ultraviolet wave
an electromagnet wave that is just beyond (more energetic than) violet visible light
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Frequency
790 THz to 30 PHz
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Wavelengths
380 nm to 10 nm
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Uses
medical treatment, dentistry, killing bacteria
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X-ray
photograph taken with x-ray
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Frequency
30 PHz to 30 EHz
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Wavelength
10 nm to 10 pm
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Uses
medical imagery, transportation security, nondestructive inspection
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Gamma ray
a high-energy photon that is emitted from a nucleus when a radioactive isotope experiences gamma decay
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Frequency
above 30EHz
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Wavelengths
10 pm down to 1 fm
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Uses
medical treatment, astronomy
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amplitude modulation
the process of putting information into a radio wave by changing, or modulating, the amplitude of the wave
36
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frequency modulation
the process of putting information into a radio wave by changing, or modulating, the frequency of the wave
37
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electromagnetic wave
a disruption in an electromagnet field that carries energy, even through the vacuum of space
38
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electromagnetic spectrum
the entire range of all electromagnetic wave s
39
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radio wave
the longest and lowest energy type of electromagnet wave
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