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Apologia Chem M 3B
Atomic Structure, second half
Question | Answer |
---|---|
The particle model of light states | that light is made up of small particles called photons. |
The wave model of light states | that light is a wave that travels much lie a wave on the ocean. |
Particle/wave duality theory | The theory that light sometimes behaves as a particle and sometimes it behaves as a wave. |
crests | the high point of waves |
troughs | the low point of waves |
wavelengths | the distance between the crests (or troughs) of a wave |
amplitude | a measure of the height of the crests or the depths or the troughs on a wave |
visible spectrum | the range of light wavelengths that are visible to the human eye |
physical constant | a measurable quantity in nature that does not change |
frequency | the number of wave crests (or troughs) that pass a given point each second |
Hertz | unit meaning 1 per second |
when a wavelength is large, | the frequency is small |
when a wavelength is small, | the frequency is large |
While we often use several of the light waves with wavelengths longer than visible light, | we do NOT frequently use any of the light waves with wave lengths shorter than visible light. |
The energy of a light wave is directly proportional to | its frequency. |
A light wave's wavelength is | inversely related to its energy. |
Light with wavelengths shorter than visible light has enough energy to | kill living tissue. |
Gamma rays and X-rays are more energetic than ultraviolet light, so they are | more dangerous to living tissue. |
Light is an electromagnetic phenomenon, produced by the interaction of electrically charge particles, so it is often called | electromagnetic radiation. |
Planck's constant | Joule-second |
The rods in our eyes are sensitive mostly to | low levels of light and are not very sensitive to color. |
The cones in our eyes respond to | certain specific energies of light. |
Cones get tired pretty quickly, and when they have sent the same signal to the brain for a period of several seconds, | they eventually just shut off. |
The way we perceive color, then, is based on | the energy of the light that hits our eyes. |
Atoms seem to emit | individual wavelengths of light. |
Most colors we see are the result of | a range of wavelengths, not individual ones. |
Each element produces its own | unique set of wavelengths when heated or electrified. |
If you need to determine the atoms in a substance, one way to do so is to | heat the substance up and determine the wavelengths of light that are emitted. |
spectrometer | a scientific instrument that can analyze the light and determine all of the individual wavelengths that make it up |
spectroscopy | the process by which individual wavelengths of light emitted by a substance are analyzed |
Niels Bohr | took Rutherford's planetary mode and added his own twist; suggested that there were several possible orbits that electrons could be in |
nucleus | center of the atoms, including the neutrons and protons |