chem107f09wk6s0

chem107f09wk6s0 - Waves Chp. 6.2 Wavelength () distance...

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Wavelength ( λ ) – distance between identical points on successive waves. Units – nm (10 -9 m), Å (10 -10 m), pm (10 -12 m) Waves Chp. 6.2
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Frequency ( υ ) – number of wavelengths that pass through a particular point in one second. Units – Hz (s -1 ) Waves Chp. 6.2
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In a vacuum electromagnetic waves travel at the speed of light (c = 2.9979 x 10 8 m/s) λν = c Waves Chp. 6.2
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A laser produces red light of wavelength 632.8 nm. Calculate the frequency of this light. Waves Chp. 6.2
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Electromagnetic waves originate from the movement of electric charges and can travel through empty space. Electromagnetic Spectrum Chp. 6.2
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Visible Spectrum Chp. 6.2
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Which light has the higher frequency: the bright red brake light of an automobile or the faint green light of a distant traffic signal? Visible Spectrum Chp. 6.2
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Continuous Spectrum Chp. 6.2
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Δ E = Δ nh ν where h is Planck’s constant, 6.63 × 10 -34 J s and n is an integer Max Planck explored the relationship between intensity and frequency of light emitted of a hot object. The wavelength of the light emitted is dependent of the temperature (vibrational frequency of the atoms) of the object. In 1900 Planck describes energy as being quantized. Only discrete amounts of energy are lost or gained. Planck and Black Body Radiation Chp. 6.2
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In 1905 Einstein describes light as behaving like both a particle and wave . Light can be described as little quantized packets of energy called photons. Einstein and the Photoelectric Effect Chp. 6.2 E = h ν
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Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10 15 s -1 before it can emit an electron from its surface via the photoelectric effect. What is the minimum energy required to produce this effect? What wavelength will provide a photon of this energy?
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Sodium Lamp Each element has its own characteristic line spectrum Line Spectra Chp. 6.3
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Na K Li Flame Analysis Chp. 6.3
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Classical physics couldn’t explain all natural phenomena black body radiation - radiation given off by extremely hot objects due to vibrating atoms. Color is dependent on temperature not material. No single theory described behavior for all frequencies of radiation.
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chem107f09wk6s0 - Waves Chp. 6.2 Wavelength () distance...

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