A half life graph plots the activity of a radioactive source against time, and the graph builder draws it for twelve real isotopes from technetium 99m to uranium 238. Switch on the half life line and a dashed construction drops from half the starting activity to the time axis, so the class reads the half life off the graph the way the exam expects.
A hand-built replica of the real builder page, not a screenshot. Every control shown exists in the product.
Part of the Graph builder, Velocity time graphs, IV characteristic graphs, Infrared radiation graphs and Distance time graphs pages.
The graph above is iodine 131, a medical tracer with a starting activity of 400 Bq. The dashed lines run across from 200 Bq and down to 8 days, and a second reading from 100 Bq lands at 16 days, which is the check that tells pupils the half life is constant. The lines are drawn in the colour you choose, or hidden so the class has to construct them.
The usual slip is reading the time for the activity to reach zero, or halving the time axis instead of the activity axis. A curve that never reaches the axis makes the first mistake visible, and picking a different isotope from the list changes the units from hours to days to years while the shape stays the same, which is the point the specification wants made.
Diagnostic multiple choice. Each answer reveals what the class does and doesn't understand.
Answers revealed when you click. Great for starters or extension questions.
Match keywords to their definitions. Great for prior learning or end-of-lesson review.
Every tool turns a few inputs into a clean, exam-ready diagram.
Braking, acceleration and terminal velocity scenarios on GCSE graph paper, with the area under the line as distance.
Ohmic conductor, filament lamp and diode on symmetric axes, the required practical graphs in one click.
Heating to equilibrium and cooling curves for matt black, matt white and shiny silver surfaces.
Journeys you edit point by point on GCSE graph paper, with a tangent tool that reads the speed off the gradient.
Equation selection, rearrangement and substitution practice, step by step.
Free-body diagrams, resolve into components, find the resultant on GCSE graph paper.
Before and after collision diagrams with selectable unknowns and a step-by-step reveal.
Graph-paper lens, focal points and object for teaching ray construction.
Curated GCSE nuclear equations covering alpha, beta, fission, fusion and decay chains.
Build circuits from standard GCSE symbols and components.
Practical results tables with repeat readings, a mean and an optional anomaly, plus curated reference data.
Upload any diagram and the labels are suggested for you to drag, edit and blank.
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