CEM 141 MSU Exam 2 with Questions and Correct Answers
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Course
CEM 141
Institution
CEM 141
Lights acts as what? - Particle and wave.
Wavelength - The distance (m) of waves from peak to peak. Short: x-ray (red), long:
infrared (blue)
Short - higher energy
Long - lower energy
Frequency (V) - The number of wavefronts per second. Highest: x-ray
Velocity of Light - C = 3.00 X 10^8
CEM 141 MSU Exam 2 with Questions and Correct A nswers Lights acts as what? - ✔✔Particle and wave. Wavelength - ✔✔The distance (m) of waves from peak to peak. Short: x -ray (red), long: infrared (blue) Short - higher energy Long - lower energy Frequency (V) - ✔✔The number of wavefronts per second. Highest: x-ray Velocity of Light - ✔✔C = 3.00 X 10^8 = wavelength X frequency Amplitude - ✔✔The intensity, height of peaks of waves. Highest: blue light Energy of Wave (J) - ✔✔Increases as frequency increases and as wavelength decreases. Highest: x -ray Range o f Wavelengths - ✔✔10^-16 - 10^8 = 24. Only a third are visible Black Body Radiation - ✔✔When a mass is heated it emits a type of EM radiation, at very high temps the mass becomes "white hot" because all wavelengths of visible light become equally intense Photoelectric Effect - ✔✔Metals emit electrons when electromagnetic radiation shines on the surface, light is transfers energy to the electrons at the metal's surface where it's transformed into KE that gives the electrons enough energy to leave the atom Depends on frequency not intensity How many electrons are emitted if the light is below it's threshold frequency no matter the intensity? - ✔✔None. What increases the number of electrons to be emitted by the photoelectric effect? - ✔✔Intensity. A particle that transfers light energy with a definable energy, emits one electron energy of = h (6.626 x 10^ -34 J) - ✔✔Photon. Energy of light equation? - ✔✔E = hV. h - ✔✔Planck's constant, the energy of a photon. What happens to the energy when there is a short wavelength? - ✔✔High energy. Light from the sun (white light) can be separated by a prism to create this, only a small part of the full EM spectrum? - ✔✔Visible Spectrum. Atomic Emission Spectrum - ✔✔Spectrum that emits photons, energy diagra m: electron goes down energy levels. Atomic Absorption Spectrum - ✔✔Spectrum that absorbs photons, energy diagram: electrons goes up in energy levels. Heisenberg Uncertainty Principle - ✔✔Principle states that we can't accurately measure both the positio n and the energy of a small particle (electron) Bohr's model did - why its wrong.
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