A-Level Physics Paper 3a Questions And Answers 100% Verified A+ Guaranteed

Write 0.000003m with a suitable prefix. {Ans: 3µm}Why should you measure background radiation before measuring the radioactivity of a source? {Ans: So that only the source's radioactivity is measured, by according for background radiation systematic error is reduced.}Is the SI unit for temperature °C or K? {Ans: K (kelvin) as this is the absolute scale.}What is reproducibility? {Ans: If the experiment is redone by a different person or with different techniques and equipment and the same results are found, it is repeatable.}What is the uncertainty of a thermometer whose smallest division is 5°C? {Ans: The uncertainty in a reading is +/- half the smallest division, so the uncertainty is +/- 5/2 or +/- 2.5°C}What quantity is measured in seconds? {Ans: Time.}