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16 Cards in this Set
- Front
- Back
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What is wavelength? |
The distance between crests of a wave |
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What is frequency? |
The rate at which crests pass by a certain point.
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The energy carried by EMR is proportional to ____________. |
Amplitude |
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What is the EMR scale? |
1. |
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What makes EMR waves unique compared to sound waves (for example)? |
EMR needs no medium in order to propagate and contain TWO PERPENDICULAR COMPONENTS - electric and magnetic. |
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What are black bodies? |
Radiation hot objects. |
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Explain classical physics theory of EMR and electron ejection. |
Classical physics believed that the longer EMR was shined on a metal, the more electrons would be released. |
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What is the ultraviolet catastrophe? |
Classical theory believed that if the light of black bodies is caused by vibrating atoms than the intensity of emitted light must have a greater intensity as wavelength decreased. However, in reality, intensity rose to a maximum and then dropped to zero. |
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How did Max Planck solve the ultraviolet catastrophe? |
Suggested that there had to be a distribution of vibrating particles in incandescent objects and that particles can only accept energy in quantized amounts. |
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What is Planks equation? |
E = (hc)/(wavelength) = h(nu) |
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Define intensity. |
Intensity is the number of quanta. |
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What is the photoelectric? |
The emission of electron from a metal surface when a beam of light strikes it. |
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What is the quantum theory? |
Light has both particle and wave properties. |
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What is the de Broglie equation? |
(wavelength of particle) = h/(mv) |
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In a hot flame or in a high voltage gas discharge tube elements are_________ |
Atomized |
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What is the Balmer series? |
The lines in the visible region of light for a H atom. |
