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Terms in this set (20)
What kind of waves are extremely hazardous to living tissue and can cause irreversible damage if absorbed?
What kind of waves can be used to destroy harmful cells such as cancerous tumours?
What is produced when electrons in an antenna are moved back and forth at a given frequency?
an electromagnetic wave with a matching frequency
Who was responsible for generating the first radio waves in his laboratory in 1887?
German physicist Heinrich Hertz
Hertz proved that radio waves share many of the same properties as what other kind of waves?
At what speed do radio waves travel?
Radio waves travel at the speed of light.
Who revolutionized the world by utilizing radio waves for purposes of wireless communication?
Italian engineer Guglielmo Marconi
What phenomenon occurs when the objects encounter a periodic disturbance that matches their natural frequency?
What effect does resonance have on an object?
The object's amplitude of oscillation increases strongly.
What happens when light of a given frequency is incident upon a material with electrons having the same resonant frequency?
The light wave is absorbed.
What does it mean when a material is considered opaque to a certain frequency of light?
The material absorbs that particular frequency of light.
True or False?
Ordinary window glass is opaque to UV light.
If the incident light does not match the resonant frequency of a material, that material is considered what?
When a material is transparent, light waves are continuously absorbed and emitted by neighboring atoms in the material until what happens?
until the wave exits through the other side of the material
What is the difference between the way light travels through transparent materials and how it moves in a vacuum?
Light passes more slowly through transparent materials than in a vacuum.
What type of material tend to be opaque to most electromagnetic waves?
The outermost electrons in metals are not bound to particular atoms and are free to migrate throughout the material, which explains why metals tend to be particularly good what?
conductors, of both electricity and heat
The color of light we see depends on what?
the frequencies of light that reach our eyes
The lowest frequency of light on the spectrum appears to most people as what?
The highest frequency of light on the spectrum appears to most people as what?
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