95339
Description
Flashcards by James Hamilton, updated more than 1 year ago
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Created by James Hamilton
almost 11 years ago
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| Question | Answer |
| Interference and diffraction show light... The photoelectric effect shows... De Broglie's... Wavelength = | As a wave Light as a particle Wave-particle duality Planck's Constant / momentum |
| Electron diffraction shows... | Wave nature of electrons |
| Max Ek of the photoelectrons increases as... Number of photoelectrons emitted is proportional to the... No electrons are emitted if... | Frequency of radiation increases Intensity of the radiation The frequency is below the threshold |
| Photoelectric effect can't be described by wave theory of light because... (according to wave theory) 4 points | Energy is proportional to the intensity Energy carried by the light would spread evenly over wavefront Each electron would gain a bit on energy Gradually all electrons could leave |
| When light hits the surface... If one collides with a free electron... Energy need to break electron bonds... | The metal is bombarded by photons The electron gains energy equal to hf Work Function, value depends on the metal |
| If energy gained from photon > work function... Energy transferred to an electron is... | The electron is emitted hf |
| Electrons in atoms exist in... N=1 represents the... | Discrete energy levels Ground state |
| Fluorescent tubes use... To produce... The tubes contain... When electrons in the tube collide with free electrons... | Excited electrons Light Mercury vapour They're excited to a higher energy level |
| When excited electrons return to their ground states... Photons absorbed by... | they emit UV photons Phosphorus coating |
| Sining light on a metal... The light must be of a ... If enough energy is absorbed... This is called the... | Releases electrons High enough frequency The bonds break & electron is released Photoelectric effect |
| Spectrum of white light is... Cool gasses remove... | Continuous Certain wavelengths |
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