Radiation Animation Play

Radio Animation Play

Radioactivity Student activity Play

Relative abundance of isotopes and mass spectra Student activity Play

Right hand rule Animation Play

Roentgen's experiment Animation Play

Soil fertility; fertilization and types of fertilizers Student activity Play

Solving problems involving circles Class activity Play

Solving problems involving circles Whiteboard presentation Play

The angle between the conductor and the field lines Whiteboard exercise Play

The angle between the conductor and the field lines Simulation Play

The angle between the conductor and the field lines Animation Play

The angle between the conductor and the field lines Student activity Play

The arc subtending an inscribed angle Simulation Play

The arc subtending the central angle Simulation Play

The attraction of iron filings by magnets Animation Play

The central angle of a regular polygon Whiteboard exercise Play

The central angle of a regular polygon Student activity Play

The central nervous system Student activity Play

The central nervous system Whiteboard exercise Play

The central nervous system – the spinal cord Student activity Play

The core of a transformer Student activity Play

The core of a transformer Illustration Play

The discovery of X-rays Student activity Play

The discovery of X-rays Whiteboard exercise Play