In your physics experiments, when you take a single measurement using a ruler, a digital thermometer or other such measuring device (for which you do not have the manufacturers specification of uncertainty) you should take the uncertainty to be:

You are recording counts from a Geiger counter to measure small amounts of ionizing radiation from some samples. Whilst performing the measurement of the last sample, you get hungry and fetch and eat your lunch banana. After you finish and pack everything away, your colleague sees your banana skin. Firstly they are shocked and appalled that you would eat in a radioactive lab, this is very dangerous! But worse, bananas are mildly radioactive and its presence could have contaminated your final sample. What should you do?

If Alex's height is given as 143.9 ± 0.1 cm, which of the following statements accurately captures this?

Which of the following measurements of a length is the most precise?

If the measurement of a time period is stated as 12.5 ± 0.5 s then the percentage uncertainty in this measurement is: