Term
| most experiments require scientists to make |
|
Definition
|
|
Term
| measurements are __ the same |
|
Definition
|
|
Term
| measurments are __ diff from true value |
|
Definition
|
|
Term
| these deviations are called __ |
|
Definition
|
|
Term
| what are 2 sources of error |
|
Definition
limitations in sensitivity of instruments
imperfect tequniques or design |
|
|
Term
| what are 2 classifications of errors? |
|
Definition
|
|
Term
| random errors are __ (how often) present |
|
Definition
|
|
Term
| what is the equation for random errors? |
|
Definition
| measurement _+ random error |
|
|
Term
| what are some sources of random errors |
|
Definition
operator errors
changes in experimental conditions |
|
|
Term
| how do you minimize random errors |
|
Definition
| -take MANY trials!! and calc average |
|
|
Term
| how often are systematic errors present |
|
Definition
|
|
Term
| what is the equation for systematic errors? |
|
Definition
measurement+error
or
measurement- error
these errors shift result |
|
|
Term
| sources of systematic errors? |
|
Definition
instrumental, physical, human limitations
--device is out of calibration |
|
|
Term
| how to minimize systematic errors |
|
Definition
careful calibration
best tequniques |
|
|
Term
|
Definition
| how reproducible are the measurements |
|
|
Term
|
Definition
| how close are the measurements to the true value |
|
|
Term
| what are precision and accuracy limited by? |
|
Definition
| instrumentation and data gathering tequniques |
|
|
Term
|
Definition
identify them and there size
reduce the size of the error
better instruments, design, more data |
|
|
Term
| what is the full name for SI system |
|
Definition
| le system international d'unites |
|
|
Term
|
Definition
internationally agreed upon system of measurement
modern metric system
controled by conference genrale des poids et mesures |
|
|
Term
|
Definition
7 base units for 7 base quantites
base units are mutually independent |
|
|
Term
|
Definition
| temperature, time, length, mass, electric current, luminosity, moles |
|
|
Term
| what are SI derived units? |
|
Definition
| defined in terms of the 7 base units |
|
|
Term
| what is the derived unit for area |
|
Definition
|
|
Term
| derived unit for velocity |
|
Definition
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| diff between base quanitites and derived quantities |
|
Definition
base- mutually independent, can be measured directly
derived- defined in terms of base units, cannot be measured directly |
|
|
Term
|
Definition
| 1/299 792 458 in a second |
|
|
Term
| whose responsibility are the measurement standards |
|
Definition
inms - institiute for national measurment standards
measurement standards are regularly compared with international standards |
|
|
Term
| metric prefixes . list them. |
|
Definition
|
|
Term
|
Definition
| . get out of jail free card |
|
|
