SI units and Uncertainties

• What are the 6 base SI units?

  Kilograms, metres, seconds, moles, kelvin, ampere
• What is the prefix for $10^{15}$?


  Peta, P
• What is the prefix for $10^{12}$?


  Tera, T
• What is the prefix for $10^{9}$?


  Giga, G
• What is the prefix for $10^{6}$?


  Mega, M
• What is the prefix for $10^{3}$?


  Kilo, k
• What is the prefix for $10^{2}$?


  Hecto, h
• What is the prefix for $10^{1}$?


  Deca, da
• What is the prefix for $10^{-1}$?


  Deci, d
• What is the prefix for $10^{-2}$?


  Centi, c
• What is the prefix for $10^{-3}$?


  Milli, m
• What is the prefix for $10^{-6}$?


  Micro, µ
• What is the prefix for $10^{-9}$?


  Nano, n
• What is the prefix for $10^{-12}$?


  Pico, p
• What is the prefix for $10^{-15}$?


  Femto, f
• What is an order of magnitude?

  The $10^x$, rounded to nearest power 10
• What is the estimated diameter of an atom?

  $10^{-10} \text{ m}$
• What is the wavelength of UV light?

  $10 \text{ nm}$
• What is the height of an adult human?

  $2 \text{ m}$
• What is the distance between the Earth and the Sun (1 AU)?

  $0.15 \text{ Gm}$
• What is the mass of a hydrogen atom?

  $10^{-27} \text{ kg}$
• What is the mass of an adult human?

  $70 \text{ kg}$
• What is the mass of a car?

  $1000 \text{ kg}$
• How many seconds are in a day?

  $86400 \text{ s}$
• How many seconds are in a year?

  $3 \times 10^{7} \text{ s}$
• What is the speed of sound in air?

  $300 \text{ ms}^{-1}$
• What is the power of a lightbulb?

  $60 \text{ W}$
• What is the atmospheric pressure?

  $1 \times 10^{5} \text{ Pa}$
• What is random error?

  Unpredictable fluctuations in instrument readings
• What is systematic error?

  Error from faulty instruments or methods
• What is zero error?

  Reading when true value is zero
• What are precise measurements?

  Very little spread around mean value
• What are accurate measurements?

  Measurements close to the true value
• What does it mean for an experiment to be repeatable?

  Same results using same equipment and method
• What is reproducibility?

  Can be repeated by different person or equipment
• What is resolution?

  Smallest change in quantity that affects reading
• What is uncertainty?

  Difference between actual reading and true value
• What is absolute uncertainty?

  Uncertainty given as a fixed quantity
• What is fractional uncertainty?

  Uncertainty as a fraction of the measurement
• What is percentage uncertainty?

  Uncertainty as a percentage of a measurement