Clip description Keywords
Absorption and reflection of light
Absorption and reflection of light

Duration: 01:10

How light is absorbed, transmitted or reflected as it hits a surface.

 
An unusual source of light
An unusual source of light

Duration: 00:37

Fibre optic cables make a worker's safety vest glow in the dark, demonstrating an unusual source of light.

 
Bats catch fish using echolocation
Bats catch fish using echolocation

Duration: 02:15

A Rickett's mouse-eared bat is seen in slow motion, using echolocation to catch fish.

 
Broadband internet for the aviation industry
Broadband internet for the aviation industry

Duration: 01:42

The internet is to be made available to the previously unconnected world of aviation through a satellite broadband signal.

 
Calculating the speed of light
Calculating the speed of light

Duration: 03:59

Laser light is beamed into space to calculate the speed of light.

 
Calculating the speed of light using a microwave
Calculating the speed of light using a microwave

Duration: 04:09

A practical demonstration using a microwave and buttered bread to calculate the speed of light.

 
Coloured light filters
Coloured light filters

Duration: 00:45

The effect of coloured filters on coloured light is demonstrated.

 
Defeating a US Navy sound weapon
Defeating a US Navy sound weapon

Duration: 04:49

Can Dallas Campbell defeat a US Navy sound weapon with a little help from a 'super duper noise cancelling thing'?

 
Dolphins use sonar to locate food
Dolphins use sonar to locate food

Duration: 01:56

Dolphins hunt collaboratively after using sonar to track and locate their prey.

 
Echoes and their use in sonar
Echoes and their use in sonar

Duration: 01:10

An introduction to echoes and how they are used in sonar to locate objects under water.

 
Experiencing the speed of sound
Experiencing the speed of sound

Duration: 00:52

Sound travels through a 340m coil of tubing giving the presenter the opportunity to experience the resulting one second delay for himself.

 
Find out how long sound takes to travel
Find out how long sound takes to travel

Duration: 04:05

Presenter Greg Foot uses the speed of sound to play with time and make Big Ben chime thirteen times at midnight.

 
Frequency and amplitude of sound
Frequency and amplitude of sound

Duration: 00:59

An investigation into the effects of high amplitude sound on a wine glass.

 
Frequency and pitch
Frequency and pitch

Duration: 01:13

The difference between frequency, pitch, and amplitude.

 
Frequency and vibration of sound
Frequency and vibration of sound

Duration: 00:52

Sound at a particular frequency is used to vibrate a glass plate enough to topple a tower of wooden blocks.

 
Heliostats - lighting a room with sunlight
Heliostats - lighting a room with sunlight

Duration: 00:39

At Manchester Airport a moving mirror or heliostat is used to reflect sunlight into the terminal building.

 
How do you make a rainbow?
How do you make a rainbow?

Duration: 03:04

A practical demonstration of rainbow formation in the laboratory and in the atmosphere.

 
How does sound travel through a liquid?
How does sound travel through a liquid?

Duration: 01:20

Sound travels through liquids as well as through the air, as demonstrated by a team of synchronised swimmers.

 
How does sound travel through a solid?
How does sound travel through a solid?

Duration: 02:20

An investigation into how sound travels through solids, using a string telephone as an example.

 
How does sound travel through the air?
How does sound travel through the air?

Duration: 01:18

A demonstration of how sound travels through the air or any other medium.

 
How light travels
How light travels

Duration: 01:21

Light travels in straight lines but how fast does it travel?

 
How long does it take reflected light to travel from the Moon to the Earth?
How long does it take reflected light to travel from the Moon to the Earth?

Duration: 00:39

The time taken for reflected light to travel from the Moon to the Earth is calculated.

 
How sound waves are made
How sound waves are made

Duration: 03:41

Sound engineer Martin Desai of the School of Sound Recording in Manchester, using the aid of a slinky, to explain to Andy Williams and Jimi Goodwin of the band Doves how sound waves are made.

 
Lateral inversion in a mirror
Lateral inversion in a mirror

Duration: 01:00

The presenter demonstrates lateral inversion in a mirror.

 
Light and reflection
Light and reflection

Duration: 01:55

Light is reflected off a smooth surface but scatters off a distorted surface.

 
Making music using a cattle grid (pt 1/2)
Making music using a cattle grid (pt 1/2)

Duration: 04:54

Jem Stansfield from 'Bang Goes The Theory' explains that sound is produced by vibrations and that the frequency of the vibrations determines the pitch of the sound. Jem then outlines a project to generate a tune by driving over a custom made length of 'cattle grid'.

 
Making music using a cattle grid Clip 2 of 2
Making music using a cattle grid Clip 2 of 2

Duration: 04:09

Jem Stansfield and Dallas Campbell from 'Bang Goes The Theory' use a three-wheeled car to drive over Jem's custom made 'cattle grid' which has differently spaced rungs in order to generate a recognisable tune.

 
Mirrors and angles
Mirrors and angles

Duration: 02:06

Multiple images are produced by two mirrors set at a variety of angles.

 
Optical fibres – development and uses
Optical fibres – development and uses

Duration: 05:11

The history of fibre optics is described. The ability of glass to bend when it is very thin is explained. Total internal reflection is demonstrated and explained.

 
Phase cancellation and sound waves
Phase cancellation and sound waves

Duration: 03:42

How sound waves can constructively and destructively interfere with each other and the problems it causes in the music industry.

 
Recreating the first moments of recorded sound
Recreating the first moments of recorded sound

Duration: 03:04

Dara O Briain and Mark Miodownik use a phonograph to record and replay sound.

 
Reflectors and light sources
Reflectors and light sources

Duration: 00:46

A discussion about the relative merits of reflectors and light sources.

 
Refraction
Refraction

An explanation of refraction including a practical demonstration of how Pyrex seems to disappear in vegetable oil.

 
Refraction and dispersion of light through a prism
Refraction and dispersion of light through a prism

Duration: 00:33

The refraction and dispersion of white light is demonstrated as it passes through a prism.

 
Resonant frequencies shatter glass Clip 1 of 2
Resonant frequencies shatter glass Clip 1 of 2

Duration: 02:58

Dr Yan from 'Bang Goes The Theory' measures the resonant frequency of a wine glass and then reproduces it on a violin, causing the wine glass to shatter.

 
Resonant frequencies shatter glass Clip 2 of 2
Resonant frequencies shatter glass Clip 2 of 2

Dr Yan from 'Bang Goes The Theory' shows how the resonant frequency of a flat sheet of glass is produced using a double bass, causing the glass to shatter.

 
Reverberation of sound
Reverberation of sound

Duration: 01:54

A demonstration of the reverberation of sound on hard surfaces.

 
Silence!
Silence!

Duration: 01:49

They say that in space no-one can hear you scream. Sparks fly as presenter Jem explains why with the help of an angle grinder and a bell jar.

 
Sound and vibration
Sound and vibration

Duration: 01:39

Various objects such as the strings of a violin or the air entering a French horn are vibrated to produce sound.

 
Sound and vibration - a puzzle
Sound and vibration - a puzzle

Duration: 00:39

Sound and vibrations are discussed and a puzzle involving the effects of vibration is presented and explained.

 
Sound frequency - how musical instruments make different waveforms
Sound frequency - how musical instruments make different waveforms

Duration: 03:00

Sound engineer Martin Desai of the School of Sound Recording in Manchester, explains to Andy Williams and Jimi Goodwin of the band Doves how musical instruments make sound waves.

 
Sound insulation
Sound insulation

Duration: 01:09

An investigation into the use of soft fibre panels in a room to absorb sound waves.

 
Sound waves
Sound waves

Duration: 01:18

The frequency and amplitude of a sound wave dictate what it sounds like.

 
Speed of light
Speed of light

Duration: 03:55

Exploration of Einstein's Theory of Special Relativity using the hypothetical example of a very fast car turning its headlights on.

 
Stirring Sounds
Stirring Sounds

Duration: 03:08

An explanation of the 'hot chocolate effect' in which the sound made from stirring a mug of water varies with temperature and solute.

 
The Pepper's ghost illusion
The Pepper's ghost illusion

Duration: 03:28

An investigation into the use of partial reflection to produce the Pepper's Ghost illusion.

 
The photoelectric effect
The photoelectric effect

Duration: 04:53

Jim Al-Khalili describes how the photoelectric effect was discovered by Heinrich Hertz and then explained by Einstein.

 
The visible light spectrum and its uses
The visible light spectrum and its uses

Duration: 02:42

Reflected spectra of light are used to determine the colour difference between samples of paint.

 
Total internal reflection
Total internal reflection

Demonstration and explanation of total internal reflection, and description of its use in fibre optics.

 
Types of light in the universe
Types of light in the universe

Duration: 03:29

Brian Cox describes different types of light and how we can detect the oldest light in the universe.

 
Vibrations, amplitude and sound
Vibrations, amplitude and sound

Duration: 01:38

The presenter investigates the amplitude of vibrations and how this is related to the loudness of a sound.

 
Wave reflection
Wave reflection

Duration: 00:51

Demonstrating the reflection of waves.

 
Wave refraction
Wave refraction

Duration: 01:26

Refraction through a D block is shown with an explanation of total internal reflection before introducing optical fibres.

 
What happens if I turn the headlights on in a car going at the speed of light?
What happens if I turn the headlights on in a car going at the speed of light?

Duration: 04:58

Exploration of Einstein's Theory of Special Relativity using the hypothetical example of a very fast car turning its headlights on.

 
Why are black holes invisible?
Why are black holes invisible?

Duration: 03:47

Brian Cox explains why black holes cannot be seen.

 
Why is the sky blue?
Why is the sky blue?

Duration: 4:43

Presenter Greg Foot discovers why the sky is blue. He does this by examining the effect of the atmosphere on sunlight at different altitudes as the air pressure of the atmosphere changes.

 
Why the sky is blue
Why the sky is blue

Duration: 03:31

An experiment to show why the sky appears blue and the Sun changes from yellow to red as it sets.

 

BBC navigation

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.