Particle Nature of Light

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Presentation transcript:

Particle Nature of Light Section 5.1 Continued Particle Nature of Light

Objectives Compare the wave and particle models of light. Define a quantum of energy and explain how it is related to an energy change of matter. Contrast continuous electromagnetic spectra and atomic emission spectra.

Particle Nature of Light Besides having wave characteristics, light also acts like a particle. The Quantum Concept: Energy can only be gained or lost in a specified amount  A Quantum. Equantum = hv h is Plank’s Constant = 6.626 x 10-34 J•s

Blocks and Quanta Think of energy transfer like building a wall of Legos®. I can only add or take away 1 Lego. There is no such thing as a ½ Lego.

Particle Nature of Light Photoelectric Effect: electrons, called photoelectrons, are emitted from a metal’s surface when light of a certain frequency shines on the surface. Photoelectrons Light

The Photon Photon: particle of electromagnetic radiation no mass carries a quantum of energy Ephoton = hv

Neon Signs

Atomic Emission Spectra Electricity passed through a tube of gas Gas atoms absorb energy and become excited Atoms release the energy absorbed in the form of light. Each atom has specific frequencies it will release in the light form.

Atomic Emission Spectra Hydrogen (H) Helium (He) Oxygen (O) http://astro.u-strasbg.fr/~koppen/discharge/index.html

Atomic Emission Spectra Neon (Ne) Xenon (Xe) http://astro.u-strasbg.fr/~koppen/discharge/index.html

Homework 7-12 on page 126