| A | B |
|---|
| what are the units for sound intensity | decibel |
| what is the difference between the A scale and the C scale on the sound level meter | a-what people normally hear C-actual intensity |
| constructive interference | superpostion of waves resulting in a combined wave with amplitude larger than component wave |
| destructive interference | superposition of waves resulting in a combined wave with zero amplitude |
| what is the relationship between frequency and period | product of frequency time and period =1 |
| frequency | number of occurrences per unit time (s) |
| period | time needed to complet one cycle of motion |
| wavelenght | distance between corresponding pts on tow successive waves |
| pressure | force per unit area |
| transducer | changes energy from one form to another |
| how does intensity of the light vary with the distance from the light source | varies with square of distance from light source |
| law of refraction | light bends toward normal line |
| index of refraction | constant of the ratio of the sines-Snell's law |
| real image | optical image at which rays from objects converge |
| virtual image | point form wich light rays appear to diverge with out actually doing so |
| focal lenght | distance from focal pt to the center of a lens or vertex of a mirror |
| focal point | location at which rays parallel to the optical axis of an ideal mirror or lens converge |
| refraction | change in direction of light ray when passing from one medium to another |
| normal | line perp to surface |
| angle of incidence | angle between direction of motion of waves and a line perp to surface the waves are striking |
| angle of refraction | angle after waves have been refracted |
| convex | converging lens-thicker in middle than edges |
| concave | thicker in edges than middle |
| accomodation | ability of the lens to change shape to acccount for a difference in object distances |
| visual acuity | distinguishing between sources of light tha are close together |
| newton's first law | an object with no force acting on it moves with constant velocity |
| newton's second law | the acceleration of a body is directly proportional to the net force on it and inversely proportional to its mass F=ma |
| newton's third law | when one obect exerts a force on a second object, the second exerts a force on the first that is equal in magnitude but opposite in direction |
| velocity | rate at covering distance |
| acceration | rate changing velocity |
| force | push or pull-N kgm/s2 |
| centripetal force | directed toward center N |
| potential energy | energy of position J or kgm2/s2 |
| kinetic encery | energy of motion |
| vector | quantity with mag and air |
| resultant | sum of all vectors |
| inertia | tendancy to keep doing what doirn |
| FF | ration of normal to Fg |
| weight | Fg |
| what does a circuit breaker do | keep cirucits form overloading |
