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21 Cards in this Set
- Front
- Back
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describe electromagnetic spectrum |
the complete spectrum of light, including radiowaves, infrared light, visible light, ultraviolet light, x-rays, and gamma rays |
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define wavelength |
distance between two adjacent peaks |
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define frequency |
number of times the "rope" moves up and down each second |
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define photon |
an individual particle of light charaterized by a wavelength and frequency |
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what is a nanometer |
one billionth of a meter |
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list the six categories by wavelength shortest to longest -gamma -infrared -visible -radiowaves - x rays -ultra violet |
1) gamma 2) x- rays 3) ultra violet 4) visible light 5) infrared 6) radio waves |
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list the six categories by frequency least to most |
1) radio waves 2) infrared 3) visible light 4) ultra violet 5) x-rays 6) gamma |
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state the wavelength limits in the human eye |
390 - 700nm |
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state the electromagnetic radiation in the sun and by a human |
sun- ultraviolet human- infrared |
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Describe the structure of matter. |
All matter is made of atoms/molecules |
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define nucleus |
at the center of the atom contains most mass |
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define proton |
positive charge of an atom |
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define neutron |
electrically neutral part of an atom |
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define electron |
negatively charged part of the atom |
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what is the atomic number |
the number of protons inside an atom |
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what is atomic mass |
the number of protons and neutrons an atom contains |
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what is an isotope |
different variations of an element with different numbers of protons and neutrons |
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what is a molecule |
a combination of 2 or more atoms |
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define emission |
a light bulb emits visible light; the energy of the light comes from electrical potential energy supplied from the bulb |
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what is absorption |
when you place your hand near an incandescent light bulb you hand absorbs some of the light, and this absorbed energy warms your hand |
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what is transmission |
some forms of matter, such as glass or air transmit light, which means allowing it to pass through. |
