A plant nursery uses a lamp to provide light for young lettuce plants. The relative light intensity at a position is modelled by 1÷d21 \div d^21÷d2, where d d\,d is the distance from the lamp in metres.
The lamp is positioned 0.20 m from one bench and 0.30 m from another. Calculate the ratio of the relative light intensities at the nearer and farther positions.
68 exam-style questions on AQA GCSE Biology 4.1 Photosynthesis, covering 4.1.1 Photosynthetic reaction, 4.1.2 Rate of photosynthesis, and 4.1.3 Uses of glucose from photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.