OCR A Physics A level
Physics
Decks for all topics in OCR A Physics for A Level
Sample Data
| Front | Describe an experiment to determine specific latent heat. |
| Back | Same as the specific heat capacity practical where an electrical heater with known power heats a substance with a known mass.When the substance changes state, its temperature is constant.Use this temperature for the time to calculate energy transfered.Then using the equation E = mL and rearranging the specific latent heat equation, L = \( \frac{E}{M} \) |
| Tags | ThermalPhysics |
| Front | How is a capacitor discharged and what happens to the flow of electrons during this? |
| Back | - By disconnecting the power supply and connecting another electrical component (often a resistor).- The electrons on the negative plate then flow to the positive plate.- The current is high at the start, but as charge leaves the plates while discharging, the potential difference across the plates decreases.- Eventually, the charge on the plates is zero and the current and potential difference are also zero, which is when the capacitor is fully discharged. |
| Tags | Capacitors |
| Front | What is alpha decay? |
| Back | - When the nucleus emits a alpha particle, which is simply a helium nucleus.- Its ionising power is strong, but the speed is slow and can be absorbed by paper or a few cm of air.- Affected by a magnetic field.- Therefore, the mass number decreases by 4 and the atomic number decreases by 2.
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| Tags |