physics ocr quantum
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19 questions
| 🇬🇧 | 🇬🇧 |
| Define discrete | Taking only certain values , not continuous |
| Define electric field | A region of space around a charged particle in which another charged particle will feel a force |
| Define the volt | The potential difference between two points when one joule of work is done to move a charge of one coulomb |
| What is a photon? | A photon is a discrete packet of Electromagnetic energy |
| What is stopping voltage? | The smallest voltage which will prevent the photocurrent from flowing |
| What might electrons do to become more stable? | Spontaneously emit energy to move to the ground state |
| How does an LED work? | Work by accelerating electrons with an electric field to give them energy , they then release that energy as photons |
| How does frequency of the light effect the photoelectric effect? | The max kinetic energy of the photoelectrons increases as frequency increases |
| How does intensity of the light effect the photoelectric effect | The rate of emission of photoelectrons increase as intensity increases |
| What happens if a particle moves thorough a pd towards a plate of the same charge? | It will decelerate and if the deceleration is great enough particles will stop and reverse direction. |
| What is threshold frequency? | The minimum frequency required for photoelectrons to be emitted as the electron escapes form the metal |
| What is work function? | The energy required for an electron to escape from the surface of a metal |
| What is the relationship between photons and electrons? | One to one relationship , one electron absorbs one photon at once |
| How does voltage related to acceleration? | The bigger the voltage the faster the acceleration |
| What is the photon model of light? | States that light energy moves through space as discrete packets of electromagnetic energy |
| What is the equation of the energy of a photon | E=hf or E= hc/λ |
| What is the photoelectric effect equation | Hf= Φ+KEmax |
| What is the stopping voltage equation? | Hf= Φ+e Vstop |
| What is de broglie wavelength equation? | Λ= h / root(2eVm) |