A brief history of the electron microscope Slideshow Play

A change in speed during the passage to a different medium Whiteboard exercise Play

A circuit junction Animation Play

A close look at current Student activity Play

A close look at current Animation Play

A covalent bond in a hydrogen molecule Animation Play

A microscope Animation Play

A microscope Whiteboard exercise Play

A microscope Student activity Play

A microscopic image Whiteboard exercise Play

A microscopic image Student activity Play

A molecule of ethene Animation Play

A molecule of methanamine Animation Play

A p-n junction Student activity Play

A p-n junction Animation Play

A p-n junction Whiteboard exercise Play

A permanently charged body Animation Play

A plate Student activity Play

A shared electron pair Animation Play

A simplified transistor Animation Play

A spoon in a glass of water Animation Play

Absorbed dose and dose equivalent Student activity Play

Absorption spectra Student activity Play

Acidic oxides Animation Play

Acidic properties Student activity Play