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Waves

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Characteristics of Waves

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Frequency

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Amplitude

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Wavelength

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Calculating wavelength and frequency C = λv C = speed of light 3x10 8 m/s Λ = wavelength in meters v = frequency in Hz What is the wavelength of a microwave having a frequency of 3.44x10 9 Hz?

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Practice Do one on your own Complete worksheet for homework

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Electromagnetic Wave

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What does the prism reveal about visible light? Write your thoughts in your notebook

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EM Spectrum

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Visible Light

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Refraction Mediums refract light according to specific wavelength

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Particle Nature of light

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Quanta Max Planck Matter can gain or lose energy in small, specific amounts called QUANTA E quantum = hv E = energy h = Planck’s constant 6.626x10 -34 JS V = frequency

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What does this mean Energy is absorbed or released in discrete whole quanta 1hv, 2hv, 3hv 1hv, 2hv, 3hv Cool but the wave model could not not explain the photoelectric effect

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Photoelectric effect Shine light at a metal and try to eject electrons

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Photoelectric effect No matter how long you shine lower energy light (lower frequency), electrons are not ejected But even a dim light of a certain higher frequency does eject the electrons

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E quantum = hv E is energy (Joules) h = Planck’s constant 6.626x10-34Js v = frequency

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Einstein Proposed that light acts like a wave AND a particle. Think of it as a stream of tiny particles These particles are called photons PHOTON = particle of electromagnetic radiation with no mass that carries a quantum of energy

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Atomic Emission spectrum Each element has a unique spectral signature

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