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Ch.9: Atomic Physics
| Question | Answer |
|---|---|
| Which English Scientist, in 1807 presented evidence that matter is discrete and exists as particles | John Dalton |
| Dalton's major hypothesis was that each chemical element is composed of tiny, indivisible particles "Billiard Ball Model" called _____? | Atoms |
| Negative electrode | (the cathode) |
| Positive electrode | (the anode) |
| Who in 1903 discovered, "Plum Pudding Model", of the atom was a sphere of positive charge in which negatively charged electrons were embedded. | J.J. Thomson |
| Ernest Rutherford in 1911 discovered, "Nuclear Model", depicted the atom as having a dense center of positive charge called ________, around which electrons orbited. | Nucleus |
| As a whole, An atom is electrically ________ ? | Neutral |
| Positively Charged particles, now called ______? | Positive Ions |
| There is a dominant color (wavelength), which depends on temperature. A Hot solid heated to a higher and higher temperature appears to go from _______ to ________ ? | A dull red to a bluish white |
| The hotter the solid, the greater the vibrations in the atoms and the higher frequency (______ wavelength) of the emitted radiation. The wavelength of the maximum intensity component ( λ max ) becomes ________. | Shorter |
| What is the classical wave theory formula? The intensity (I) of the radiation spectrum is _________ __________ to the wavelength. | I ᴕ 1/Λ ^4 , Inversely related |
| What prediction is where the intensity should increase without limit as the wavelengths get shorter? | Ultraviolet Catastrophe |
| What is the meaning of Ultraviolet Catastrophe? | Ultraviolet because the difficulty occurs with wavelengths shorter than the ultraviolet end of the spectrum & Catastrophe because it predicts emitted energy growing without bounds at these wavelengths. |
| Who resolved the dilemma, that a radical idea that explained the observed distribution of thermal radiation intensity. | Max Planck |
| Max Planck took the first steps toward a new theory called | Quantum Physics |
| E = h*f | Energy = Planck's constant * frequency |
| Planck's Constant | 6.63 * 10 ^ -34 J*s |
| A discrete amount of energy (or a "packet" of energy). | Quantum |
| A partial of electromagnetic radiation? | Photon |
| the name atom comes from the Greek words meaning | "indivisible" "not" "I cut" |
| Means uncuttable, or indivisible, something that cannot be divided further. | Atom |
| An oscillating electron can only have discrete, or specific amounts of energy. | Quantum |
| Scientists noticed that certain metals emitted electrons when exposed to light | The photoelectric effect |
| Direct conversion of light into electrical energy is the basis for | Photocells |
| ____ Is almost immediate when exposed to light. | Electons Flow |
Created by:
tamica_s
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