CHEM-C 117 : EXAM 1
29 Cards in this Set
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Wavelength
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the distance between identical points on successive wave; the distance between peaks
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Frequency
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the number of waves that pass through a particular point in one second
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Amplitude
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vertical distance from the midline of a wave to the top of the peak or the bottom of the trough
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meters
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λ is normally expressed in
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s-1
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v is normally expressed in
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Visible light
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is only a small component on the continuum of radiant energy that is the electromagnetic spectrum
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Electromagnetic wave
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all forms of electromagnetic radiation travel in waves.
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Electromagnetic wave
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These waves have an electric AND a magnetic component
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same wavelength and frequency
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These electric and magnetic components have the same______, but travel in mutually perpendicular planes
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longer
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Lower frequency=________wavelength
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light emitted or absorbed by substances
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Much of our understanding of the electronic structure of atoms comes from the analysis of the
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Blackbody spectra and emission spectra
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Matter emits light in two prominent ways
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Blackbody radiation
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light emitted by heated objects, depends primarily on temperature
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Black body radiation
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Red glow on stovetop
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Blackbody radiation
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white glow of a tungsten light bulb
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wavelength of the emitted radiation
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The amount of energy given off by an object at a certain temperature depends on
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infra-red light
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energy we cannot see with our eyes
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Max Planck
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1858‐1947, German physicist, 1918 Nobel Prize in Physics
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Max Planck
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discovery of energy quanta
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Greater
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The higher its frequency, the _____ the kinetic energy of the ejected electron
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Planck's constant
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6.63 x 10-34 J∙s
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Quantum theory (Vending Machine)
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according to the ___________, the energy is NOT continuous
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Alber Einstein
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used Max Planck’s discoveries to explain the photoelectric effect
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Photoelectric Effect
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electrons are ejected from the surface of a metal exposed to the light of at least a certain minimum frequency
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threshold frequency
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electrons are ejected from the surface of a metal exposed to the light of at 'least a certain minimum frequency'
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proportional
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The number of electrons ejected is________ to the intensity or brightness of the light
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Photons
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particles of light
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wave frequency
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Each photon has an energy that is determined by
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stream of particles
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a) Beam of light = ------------- = photons
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CHEM-C 117: CH. 13 CHEMICAL KINETICS