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12 Cards in this Set
- Front
- Back
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Once the threshold frequency is surpassed, what does the kinetic energy of theelectrons emitted depend on? |
The frequency of the light |
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What does the number of emitted electrons depend on? |
The intensity of light |
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Which famous scientist won a Nobel prize for his work on the photoelectric effect? |
Albert Einstein |
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Who discovered the photoelectric effect? |
Heinrich Hertz (1888) |
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What is a continuous spectrum? |
light that is being diffracted consisting of many wavelength components |
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What is a discontinuous spectrum? |
the source of a spectrum producing light having only a relatively small # of of wavelength components. These are also called atomic, line or spectra. |
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What is the excited state? |
When e- absorb energy they jump to levels farther from the nucleus, which are higher in energy. |
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What is destructive interference? |
The cancellation of waves |
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What was Bohr's Theory? |
1. e- moves in circular orbits about the nucleus 2. the e- only has a fixed set of allowed orbits called stationary states in which each e- has unique values (this is the ml #) 3. An e- can only pass from one orbit to another. In such transitions, fixed discrete quantities of energy are involved-either absorbed or emitted. |
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Who first suggested that light has particle-like properties? |
Albert Einstein |
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Who suggested that small particles of matter may display wave-like properties? |
Louis deBroglie |
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What is the Uncertainty principle? |
If we know precisely the position of a particle, we cannot precisely know where the particle has come from or where it is going. |
