S10P1CLec22A

S10P1CLec22A - Physics 1C Lecture 22A "There are two ways...

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Physics 1C Lecture 22A "There are two ways of spreading light: to be the candle or the mirror that reflects it." --Edith Wharton
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The Nature of Light An interesting question developed as to the nature of light: if light is indeed a wave then why can it travel from the Sun to Earth when there is no medium present? The answer: Light is a particle (photon), particles do not require a medium. But if light is a particle, then how can it bend around corners? The answer: Light is a wave, waves that propagate outward can bend around an obstacle.
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The Nature of Light But, if light is a wave how does that explain the photoelectric effect? The answer: Light is a wave, waves will create bright/dark spots depending on path length difference. The answer: Light is a particle, only particles with high energy can eject the electrons. But if light is a particle, then how does this explain the “standing wave” pattern I see with interference from double slits?
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The Nature of Light But how can light be both a particle and a wave? We say that light can have both wavelike properties and particle-like properties. This is called wave-particle duality. In some experiments light acts as a wave and in others it acts as a particle. Experimenters will Fnd whatever they are testing for. Nature prevents testing both qualities at the same time.
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The Nature of Light We can identify light as being “particles” called photons. Each photon has a particular energy which is quantiFed by its frequency. Note how wave-particle duality is incorporated
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This note was uploaded on 06/03/2010 for the course PHYS PHYS 1C taught by Professor F during the Spring '00 term at UCSD.

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S10P1CLec22A - Physics 1C Lecture 22A "There are two ways...

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