Which of the following is the correct definition of an Astronomical Unit (AU)?
the average distance between the Earth and the Sun
the distance that light travels through a vacuum in one year
the time taken for light to travel from the Sun to the Earth
the orbital speed of the Earth as it moves around the Sun
100 exam-style questions on CIE IGCSE Physics 6.1 The Earth and the Solar System, covering 6.1.1a Rotation of the Earth, the seasons and the Moon, 6.1.1b Average orbital speed, 6.1.2a Contents of the Solar System, 6.1.2b Formation of the Solar System, 6.1.2c Gravitational field strength of a planet, and 6.1.2d Orbits and gravitational attraction. Each one has a worked solution and a mark scheme showing where the marks go.