Frequency is the measurement of the total number of complete cycles or oscillations that a wave goes through in one second, and it is expressed in hertz (Hz). Frequency is a fundamental attribute that dictates the rate at which a wave...

Electromagnetic waves are fundamental to understanding the nature of light and are oscillations of electric and magnetic fields that travel through space, carrying energy from one place to another. The spectrum of light is a...

This video helps students understand the nature of waves, and enables them to create their own waves. Through experimenting with waves students will identify the various features of waves, and what makes waves different from each other....

Plants, unlike most living things, produce their own food through a process called photosynthesis. Photosynthesis means 'making using light'. Plants use the energy from the sunlight to make food. The food matter comes from carbon dioxide...

Heisenbergs uncertainty principle says that if we know everything about where a particle is located, we know nothing about its momentum. Conversely, if we know everything about its momentum, then we know nothing about where the particle...

The distance between corresponding points on two successive waves, and therefore the length of a complete cycle of a wave.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using...

An instrument that measures the intensity of electromagnetic radiation over a range of wavelengths.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise...

The complete range of wavelengths, considered as a continuum, of all kinds of electromagnetic radiation.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and...

A wave with both magnetic and electrical field components, which oscillate perpendicular to each other.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and...

Capable of transmitting light, or more generally something that allows radiation to pass through relatively unhindered.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using...

Electromagnetic radiation in the region of the spectrum between visible light and x-rays, about ten to 400 nanometres in wavelength.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds...

A transmitter or receiver that converts alternating electric currents into electromagnetic waves, or vice versa.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning...

Discover how different wavelengths allow scientists to measure the distance to the stars.
<

br/>

Physics - Universe - L
ea
rning Points.
/> A Twig FactPack Film.
Open a discussion on what has been already...

Microwaves are not only used to heat food. Mobile phones utilise this type of electromagnetic radiation, allowing us to communicate over large distances. Physics - Waves - Learning Points. Mobile phones work by converting the sound into...

The atmospheric composition of the sky affects the colours we see. From blue horizons to red sunsets, why do we see colours the way we do? Physics - Our Solar System - Learning Points. Light is made up of different wavelengths. Our...

What is refraction and how does it produces the colours and shape of a rainbow? Earth Science - Weather - Learning Points. Rainbows are beautiful tricks of the light. Rainbows are caused when light is reflected and refracted by water....

We have sent messages around the world and into space, but communicating underwater remains a challenge. How and why do radio waves allow us to talk to submarines? Physics - Waves - Learning Points. Salt water absorbs sound waves making...

The world appears to be a colourful place, but what are colours? What properties of light determine what colour we see? Physics - Waves - Learning Points. Colour is how our brains perceive different wavelengths of light. Newton...

The properties of high frequency electromagnetic radiation are incredibly important in the world of medicine, allowing physicians to look inside the human body and even combat cancer. Physics - Waves - Learning Points. X-rays and gamma...

The range of electromagnetic radiation in the electromagnetic spectrum is huge. Where does this radiation come from and how do the frequencies and wavelengths vary? Physics - Waves - Learning Points. Electromagnetic radiation is all...

Concentrated light can be incredibly powerful and useful. Learn how laser beams are produced by controlling how atoms emit photons of light. Physics - Waves - Learning Points. Lasers are photons of the same frequency going in the same...

From radio waves to gamma rays, the electromagnetic spectrum is useful in different ways. How does this radiation differ and how can they be used? Physics - Waves - Learning Points. Electromagnetic radiation exists along a continuous...

How a unique but simple experiment in the 19th century gave a new insight into the behaviour of sound waves. Physics - Waves - Learning Points. The Doppler Effect is when the pitch of a sound seems to change as it moves past. The...

We use a prism to split white light into its constituent colours. Light is passed through a slit in a screen before it hits the prism. The prism refracts the light and we can see the different colours. A second slit can be used to see...