In the design of solar panels for deep-space probes, engineers must calculate the solar irradiance, which is defined as the rate of solar energy incident on a unit area perpendicular to the rays.
Which of the following represents solar irradiance expressed in SI base units?
kg m2s−3\text{kg m}^2 \text{s}^{-3}kg m2s−3
kg s−3\text{kg s}^{-3}kg s−3
kg s−2\text{kg s}^{-2}kg s−2
kg m s−3\text{kg m s}^{-3}kg m s−3
18 exam-style questions on Edexcel GCSE Physics 1.1 Units and quantities, covering 1.1.2 Unit prefixes, conversions, significant figures and standard form. Each one has a worked solution and a mark scheme showing where the marks go.