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Honors Chemistry Unit 3 - Electrons

Honors Chemistry Unit 3 - Electrons. Lesson 2 – Photoelectric Effect & Wave Formulas Book Section: 4-1 Do Now: Prepare for Quiz 3-1. Objective: SWBAT use wave formulas to solve problems w/ frequency & wavelength. Agenda: Quiz, Lesson, Videos, Element of the Day. Electromagnetic Radiation.

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Honors Chemistry Unit 3 - Electrons

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  1. Honors ChemistryUnit 3 - Electrons Lesson 2 – Photoelectric Effect & Wave Formulas Book Section: 4-1 Do Now: Prepare for Quiz 3-1. Objective: SWBAT use wave formulas to solve problems w/ frequency & wavelength. Agenda: Quiz, Lesson, Videos, Element of the Day

  2. Electromagnetic Radiation • All electromagnetic radiation travels at the same velocity: the speed of light (c). • c = 3.00 x 108 m/s

  3. Practice • The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm. What is the frequency of this radiation?

  4. Practice • The yellow light given off by a sodium vapor lamp used for public lighting has a wavelength of 589 nm. What is the frequency of this radiation? • 5.09 x 1014 s-1 (or Hz)

  5. Photoelectric Effect • Problem with light as a wave – does not explain the photoelectric effect. • Albert Einstein – won Nobel Prize for showing that the color of light determines energy, not intensity. • VIDEO: Photoelectric Effect

  6. Photoelectric Effect • The only way to rationalize that the color matters more than intensity was to think of light as a “packet,” or particle of light called a photon. • Blue photons had more energy than red photons. • You can shoot a machine gun against a brick wall, but the wall won’t fall. You need a wrecking ball. Lots of red photons won’t generate a current, but a few blue ones will. • Light behaves as both a wave and as a particle…… strange…

  7. HW 3-2: #24-25 • This Week: • Thursday: The Mole & Energy of Light (4-1), Quiz 3-2 • Friday: The Bohr Model of the Atom (4-1), Quiz 3-3 • Likely Unit 3 Test Date: Tuesday, October 19

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