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Waves & Energy H Ch 5&6
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Waves Vibrating disturbance by which energy is transmitted Amplitude (Wavelength) u = λν
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Calculate the wavelength ( ) of yellow light if its frequency ( ) is 5.10 x 10 14 Hz. Example 1
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What is the frequency ( ) of radiation with a wavelength ( ) of 5.00 x 10 -8 m? What region of the electromagnetic spectrum is this radiation? Example 2
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Electromagnetic Radiation c = λν c = 3.0×10 8
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When solids are heated, they emit electromagnetic radiation over a wide range of wavelengths Atoms and molecules could emit (or absorb) energy in discrete quantities, like small packages or bundles Quantum Theory E = h x Planck’s constant (h) h = 6.63 x 10 -34 J s E = hc / λ Because = c/λ
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How much energy does a wave have with a frequency of 2.0 x 10 8 Hz? ( h = 6.626 x 10 -34 J. s) Example 1
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Phenomenon in which electrons are ejected from the surface of certain metals exposed to light Photon is a “particle” of light Photoelectric Effect h KE e - E = h x
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Particle-Wave Duality Possessing both particle like and wave like properties Not unique to light, but is also characteristic of all matter including e −
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Bohr ’ s Theory e - can only have specific (quantized) energy values light is emitted as e - moves from one energy level to a lower energy level
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Spectroscope Instrument used to measure properties of light over a specific portion of the em spectrum
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Emission Spectra
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Line Emission Spectrum of Hydrogen Atoms Energize the sample
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Flame Test
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Neon Signs
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