2071445
Descrição
FlashCards por kangarew97, atualizado more than 1 year ago
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Criado por kangarew97
quase 10 anos atrás
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| Questão | Responda |
| Electric Field Strength | The force experienced per unit charge exerted on a positive charge placed at that point. |
| Coulomb's Law | Two point charges exert an electrical force on each other that is directly proportional to the product of their charges and inversely proportional to the square of their separation. |
| Flemming's left hand rule | Thumb = direction of motion, First finger = magnetic field, Second finger = direction of current. |
| Magnetic flux density | When a wire carrying a current of 1A is placed at right angles to a field and experiences a force of 1N per metre. |
| Magnetic flux linkage | Number of turns x magnetic flux |
| Faraday's law of electromagnetic induction | The magnitude of induced emf is equal to the rate of change of magnetic flux linkage |
| Lenz's law | The direction of induced emf opposes the change thats producing it. |
| Farad | A capacitor has a capacitance of 1F when it can store 1 coulomb of charge per unit volt. |
| Half life | The average time taken for half the active nuclei to decay |
| Activity | The rate at which the nuclei decay or disintegrate |
| Decay constant | The probability of decay of a nucleus per unit time. |
| Binding energy | The minimum energy needed to separate all its nucleons. |
| How are x-rays produced? | When fast moving electrons smash into a target metal and are rapidly decelerated. |
| Acoustic impedance | Density x speed of ultrasound in materal |
| Astronomical unit | The mean distance between the Earth and the Sun |
| Light year | The distance travelled by light in a vacuum in a period of 1 year. |
| Parsec | The distance that gives a parallax angle of 1 second of an arc |
| Olber's paradox | For an infinite, uniform and static universe, the night sky should be bright because of light received from stars in all directions |
| Hubble's law | The recessional speed of a galaxy is directly proportional to its distance from us |
| The cosmological principle | The universe is homogeneous, isotropic and has universal laws of physics. |
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