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17 Cards in this Set
- Front
- Back
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what is frequency are what are the units used? |
frequency is the number of waves passing a point per second; the units used are 1/s, s(-1), and Hertz (Hz) |
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Before 1900 what was one of the concepts thought to be true? |
light was to behave solely as a wave |
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When discussing light what is the brightness equal to? |
brightness is equal to amplitude, therefore the brighter the light the higher the amplitude |
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what is the equation for wavelength and frequency? |
c=(Lambda)frequency |
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what is a symbol for frequency? |
v |
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what is the order of the electromagnetic radiation spectrum beggining with the shortest wavelength? |
gamma rays x-rays UV visible -roygbiv Infrared Radio |
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energy of light is not proportional to what? |
amplitude |
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What is the equation for energy of light? |
E=hv |
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what does the h stand for in the equation for energy? |
6.626 x 10(-34) |
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what is the energy of light proportional to? |
frequency |
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why didn't the photoelectric effect not work sometimes? |
because a threshold energy needed to take place |
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What are Max Planks ideas? |
The equation for energy of light energy of light is proportional to frequency there was a minimum amount of energy required in order for the photoelectric effect to take place |
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what are Einstein's ideas? |
light is a stream of particles called photons energy is quantized (has a definite, discrete quantum of energy) light is a particle-wave (wave qualities caused by oscillations of electromagnetic fields around photon) |
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what are photons |
a stream of particles which is light
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what are the ideas of Louis de Broglie? |
if light (wave) can behave as a particle, a particle can behave as a wave lambda=h/mass(volume)
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what is de Broglies equation? |
wavelength=h/mass x volume |
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what is the Heisenberg Uncertainty principle? |
trying to locate an electron with a photon knocks it off course
it is impossible to both simultaneously determine the position and velocity of an electron or any other particle |
