Module 2 Flashcards
1
Q
What is SI units?
A
Fundamental units of physical quantities.
2
Q
What is validity?
A
A measurement is valid if it measures what it is supposed to be measuring. An experimental procedure is valid if the obtained values provide an answer to the question being asked.
3
Q
State 3 ways of reducing random errors.
A
- Take at least three repeats and calculate the mean
- Use computers or data loggers
- Use higher resolution equipment
4
Q
How can systematic error be reduced?
A
Calibrate apparatus before using.
5
Q
What is meant by resolution?
A
The smallest change in the quantity being measured that gives a recognizable change in reading.
6
Q
What is absolute uncertainty?
A
Uncertainty given as a fixed quantity
7
Q
What is the difference between a reading and a measurement?
A
Readings are when one value is found, measurements are when the difference between two readings is found.
