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Bang Goes The Theory 4: Episode 5

Updated Monday 11th April 2011

This week, the team explain lasers and build a homemade one, calculate the speed of light and look at Citizen Science

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Bang on TV

Bang Goes The Theory returns to BBC One England and Wales on April 11th at 7.30pm; and in  Scotland and Northern Ireland later in the week. Full schedule and iPlayer links are on

On the 50th anniversary of the invention of the laser, Jem Stansfield explains how they work and builds himself a homemade one, Dallas Campbell looks at the rise of Citizen Science and takes part in the research projects that need people power, and Dr Yan recreates a demonstration to calculate the speed of light.

Find out more about lasers

Become a Citizen Scientist

Speed of light: in your kitchen and beyond





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