1. Working as a physicist Flashcards
What are 4 base SI quantities?
Mass (Kg)
Length (m)
Time (s)
Current (A)
Temperature (K)
Amount of substance (mol)
Luminous intensity (cd)
What is the standard form and symbol of tera?
10^12 T
What is the standard form and symbol of giga?
10^9 G
What is the standard form and symbol of mega?
10^6 M
What is the standard form and symbol of kilo?
10^3 k
What is the standard form and symbol of centi?
10^-2 c
What is the standard form and symbol of milli
10^-3 m
What is the standard form and symbol of micro?
10^-6 μ
What is the standard form and symbol of nano?
10^-9
What is the standard form and symbol of pico?
10^-12
What is the standard form and symbol of femto?
10^-15
Name three ways to reduce random errors.
Take 3 repeats and calculate a mean.
Use computers to reduce human error.
Use correct equipment to reduce uncertainty due to resultion of equipment.
Name three ways to reduce systematic error. (hint: rad, measuring vol,dist)
Calibrate apparatus by measuring a known value.
Correct for background radiation.
Read at eye level to reduce parallax error.
Define systematic errors.
An error having a non-zero mean, so that its effect is not reduced when observations are averaged
Define random errors.
An error in measurement caused by factors which vary from one measurement to another.
Contrast absolute uncertainty and percentage uncertainty.
Absolute uncertainty is given as a fixed quantity whereas percentage uncertainty is a percentage of the measurement.
How could you reduce percentage uncertainty?
Measure larger quantities
