M2C1 Flashcards
What are the units for mass?
Kilogram - Kg
What are the units for length?
Meter - M
What are the units for time?
Seconds - S
What are the SI units for temperature?
Kelvin - K
What are the SI units for an amount of a substance?
Mole - Mol
What are the SI units for Luminous intensity (light intensity)?
Candela - Cd
Express 1 nanometer in meters
1.0x10^-9
Express 1 kilometer in meters
1.0x10^3
Express 1 millimeter in meters
1.0x10^-3
Express 1 micrometer in meters
1.0x10^6
How does a random error occur?
They are caused by unknown and unpredictable changes during the experiment. Human error counts as random error
Define Systematic arrors
Systematic errors usually occur because;
-The instrument is at fault or not calibrated correctly
-The instrument is not being used correctly
They are present in almost all reading but can be removed once identified
Define a zero error
A type of systematic error where the instrument wasn’t calibrated to zero before the experiment (it wasn’t zeroed)
What’s the difference between precision and accuracy?
A group of precise reading are all close in value
An accurate reading is close to the actual answer
What do you do with the absolute uncertainties when adding/subtracting numbers?
Always add the absolute uncertainties
