Pythagorean theorem in 3-dimensional space Whiteboard exercise Play

Pythagorean theorem in 3-dimensional space Student activity Play

Radio waves Student activity Play

Reactions occurring on the surface of a solid catalyst Student activity Play

Reactions occurring on the surface of a solid catalyst Whiteboard exercise Play

Red giants Animation Play

Red giants Student activity Play

Reflecting telescopes Student activity Play

Reflecting telescopes Animation Play

Reflection of light Student activity Play

Reflection of light Whiteboard exercise Play

Reflection of light at a smooth surface Animation Play

Reflection of plane waves Student activity Play

Reflection of plane waves Animation Play

Refraction Class activity Play

Relationship between the force of friction and the roughness of a surface Animation Play

Relationship between the force of friction and the surface area Animation Play

Satellite telephones Student activity Play

Sections of a cube Student activity Play

Sections of a cube Whiteboard exercise Play

Seismic waves Student activity Play

Seismic waves Slideshow Play

Shooting stars Animation Play

Silver halides in photography Student activity Play

Solid substances as catalysts in reactions in the gaseous phase Animation Play