120968
| Question | Answer |
| Harmonics | Stationary waves for a particular system with higher frequencies than the fundamental |
| Conventional Current | Direction is from positive to negative |
| Kirchoff's 1st Law | The sum of the current entering any point in a circuit is equal to the sum of the currents leaving that same point |
| Kirchoff's 2nd Law | The sum of the e.m.f.s round a loop in a circuit is equal to the sum of the p.d.s in that same loop |
| Power | The rate of energy transfer |
| Reflection | The bouncing back of a wave from a surface |
| Refraction | The change in direction of a wave as it crosses an interface between two materials where its speed changes |
| Diffraction | The spreading of a wave when it passes through a gap or past the edge of an object |
| Wavelength of Radio Waves | x10^1 |
| Wavelength of Microwaves | x10^-2 |
| Wavelength of Infra-Red Radiation | x10^-5 |
| Wavelength of Visible Light | 4x10^-7 to 7x10^-7 |
| Wavelength of Ultra-Violet Radiation | x10^-8 |
| Wavelength of X-Rays | x10^-11 |
| Wavelength of Gamma Radiation | x10^-11 |
| Plane Polarised wave | A transverse wave that oscillates in only one plane |
| Constructive interference | When two or more waves meet in phase; the amplitudes add |
| Destructive interference | When two or more waves meet in anti-phase; the amplitudes subtract |
| Amplitude | The maximum displacement of any point on a wave from its equilibrium position |
| Wavelength | The smallest distance from a point on a wave and a similar point on the next wave |
| Period of a wave | The time taken for one complete oscillation of a point on a wave |
| Frequency | The number of oscillations per unit time of any point |
| Electron-volt | 1 eV is the energy change of an electron when it moves through a potential difference of 1 volt |
| Work Function | The minimum energy required to release an electron from the surface of a metal |
| Threshold Frequency | The minimum frequency of electromagnetic radiation required to release an electron from the surface of a metal |
| Mean Drift Velocity | The average velocity of a charge carrier as it travels through a medium due to a potential difference |
| Ohm's Law | The current through a conductor is proportional to the potential difference across it at a constant temperature |
| Displacement | The distance any part of the wave has moved from its mean position |
| Phase Difference | Angular difference by which one wave or particle leads or lags behind another |
| Speed of a wave | The distance moved by the wave per unit time |
| Coherant | Waves with a constant phase difference (same frequency) |
| Fundamental mode of vibration | The lowest frequency stationary wave for a particular system |
| Electric Current | Net movement of charge |
| Coulomb | 1C is the charge transferred in 1 second by a current of 1 amp |
| Potential Difference (P.D) | The electrical energy transferred per unit charge when electrical energy is converted into another form of energy |
| Electromotive Force (e.m.f) | The energy transferred per unit charge when another type of energy is converted into electrical energy |
| Volt | 1V is 1 joule per coulomb |
| Resistance | Resistance is the potential difference per unit current |
| Ohm | 1 ohm is the resistance when 1 volt of potential difference produces 1 ampere of current |
| Resistivity | Resistivity = (Resistance x cross sectional area) / Length |
| Kilowatt-hour | 1 kWh is the energy transferred by a 1 kW device in a time of 1 hour |
| Terminal p.d | The potential difference across the total external resistance connected to an e.m.f. surface |
| Progressive wave | A wave that carries energy from one place to another |
| Transverse wave | A wave in which the direction of oscillation is perpendicular to the direction of travel of the wave |
| Longitudinal wave | A wave in which the particles oscillate parallel to the direction of travel of the wave |
| Node | A point on a stationary wave where the amplitude is zero |
| Anti-node | A point on a stationary wave where the amplitude is a maximum |
| Principle of Superposition | When two or more waves of the same type are in the same place at the same time, the resultant displacement is the sum of the displacements of the individual waves |
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