Which statement correctly describes a condition required for a satellite to be in a geostationary orbit around the Earth?
It must orbit in the equatorial plane of the Earth.
Its orbital period must be exactly 12 hours.
It must travel in the opposite direction to the Earth's rotation.
Its altitude must be approximately 400 km400\text{ km}400 km above the Earth's surface.
27 exam-style questions on OCR GCSE Physics Beyond Earth. Each one has a worked solution and a mark scheme showing where the marks go.