What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.—D.1-Supplied constants and dataUse supplied constants such as g, c, e, u, particle masses, Avogadro constant, gas constant, Boltzmann constant, gravitational constant, permittivity of free space, Planck constant and Stefan-Boltzmann constant.Syllabus objective—D.3-A Level formulae supplied in Paper 4Select and apply supplied A Level formulae for gravitational potential, ideal gases, simple harmonic motion, electric potential, capacitors, Hall voltage, alternating current, radioactive decay, acoustic impedance, Stefan-Boltzmann law and Doppler redshift.Syllabus objective—D.4-Choosing formulae without losing physical reasoningDecide whether a supplied formula is appropriate, identify each variable, convert units, rearrange correctly and explain the physical meaning of the result rather than relying on substitution alone.Syllabus objective