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