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Photoelectric Effect

Electromagnetic radiation Energy composed of oscillating electric and magnetic fields
Electromagnetic spectrum The range of EMR of all energies from radio waves at the low end of the the spectrum to the high end of the spectrum
How was light described in the 18th and 19th centuries? As a wave because it showed wave-type behaviors
What are three behaviors of waves? Reflect: light waves bounce off some surface Refract: light waves bend when they move from traveling through one substance to another. Diffract: light waves bend when they go through an opening.
What are the characteristics of waves Wavelength Period Frequency Speed Intensity/amplitude
Wavelength Distance of the top of one wave to the top of another
Period Time for one complete wave to pass
Frequency The number of waves that pass a given point in space in a specific amount of time
Speed How fast a wave travels from one point to the other Dependent on wavelength and frequency
Intensity and amplitude For light: brightness
Speed of light in a vacuum 3.00 • 10^8 meters per second
What does EMR do when it is passed through a prism Separates into a spectrum
What are emission spectra produced by Light given off when a substance is excited by heat or electricity
What does emission spectra look like Bright lines of color against a black background
How are absorption spectra formed When light passes through a given substance
What does absorption spectra look like A rainbow of colors broken by black lines
What are absorption and emission spectra characteristics of The element that produced them
What happens when you combine a single element's absorption and emission spectra together? Why does this happen? Forms a complete rainbow or spectrum; the absorption and emission spectrum are inverses of one another
Quantized Being limited to specific values and no others
Photoelectric effect When light shone on a metal the metal would eject electrons which it the metal was connected to a meter would display an electric current
What should light with more energy do Eject more electrons
What does brighter light have Greater amplitude
What should a brighter light have More energy and eject more electrons
What does the color of light correspond to Particular wavelength and frequency
Below the threshold frequency, what happened even though bright light was shown and more energy should be ejected No electrons were ejected no matter how bright the light was
What happened at the threshold frequency Electrons began to be ejected
Created by: lesterstoffels