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32 Cards in this Set
- Front
- Back
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electromagnetic radiation
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transmission of energy through space without physical connection through varying electrical fields
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radiation
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anyway in which energy is transmitted through space from one point to another without the need for any physical connection between those two location
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electromagnetic
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the fact that energy is a beam of light is actually carried in the form of rapidly changing electric and magnetic fields
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visible light
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particular type of electromagnetic radiation to which the human eye is sensitive
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what are the invisible electromagnetic radiation?
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radio, infrared, ultraviolet, X-rays, and gamma rays
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waves
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a way in which energy is transferred from place to place without physical movement of material from one location to another
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wave period
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number of seconds needed for the wave to repeat itself at some point in space
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wavelength
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number of meters needed for the wave to repeat itself at a given moment in time
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how to measure a wavelength?
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the distance from two adjacent wave crests
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amplitude
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maximum departure of the wave from the undisturbed state
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frequency
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number of crests passing any given point per unit time
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how to find the frequency of a wave?
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1 frequency = ------ period |
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diffraction
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when light bends
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interfernece
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when crests of waves come from different sources and can reinforce or partly cancel one another
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how to find wave velocity?
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wavelength * frequency = velocity
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what charge do electrons and protons carry?
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electrons = negative protons = positive |
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electric field
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extends outwards from all charged particles
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what happens when you double the distance between two particle
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the strength is reduced by a factor of 4
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magnetic field
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govern the influence of magnetized objects on one another
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electromagnetism
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phenomenon in which fields DO NOT exist as independents, rather they are different aspects of a single physical phenomenon
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speed of light
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how quickly one charge feel the change in electromagnetic field when another begins to move
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components of visible light
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our eyes react differently to different electromagnetic waves of different frequencies
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what is red lights frequency and what is the corresponding wavelength?
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frequency = 4.3 * 10^14 Hertz wavelength = 7.0 * 10^-7 m |
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what is violet lights frequency and what is the corresponding wavelength?
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frequency = 7.5 * 10^14 Hertz wavelength = 4.0 * 10^-7 |
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full range of radiation
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humans perceive infrared radiation as heat
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electromagnetic spectrum
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spectral regions, including the visible, collectively make this
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temperature
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direct measurement of the amount of microscopic motion within it
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intensity
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term used to specify the amount or strength of radiation at any point in space
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blackbody curve
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the spread of the intensity of electromagnetic radiation emitted across the electromagnetic spectrum
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what are the two radiation laws?
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I. Peak wavelength is inversely proportional to temperature II. total energy emitted is proportional to fourth power of temperature |
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what is Wien's Law
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simple connection between the frequency or wavelength at which most radiation is emitted and the absolute temperature of the emitted
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how to express Wien's Law?
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