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...

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 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...

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...

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...

In optics, the point at which rays of light converge after refraction or reflection, and so the point at which a sharp image will be produced. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning...

Electromagnetic radiation with a wavelength between a few millimetres to about a metre, in between radio waves and infrared. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise...

The portion of the electromagnetic spectrum that our eyes can see. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...

Electromagnetic radiation present between ultraviolet and gamma rays on the electromagnetic spectrum, with wavelengths from about 0.01 to 10 nanometres. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using...

Find out why the sky is blue.
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Learning Point
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The Sun emits white light.


White light can
b

e split into the spectrum of...

Jump into 'What Is Wavelength And Frequency?' to see how waves move and groove! Perfect for curious kids on a quick, colorful science adventure.

Dr. Forrester explains light energy and how it travels.

FT Rethink - Artificial light is proving to be an ever-growing threat to biodiversity. It's harmful to pollinating insects, bats and a host of other creatures, including zooplankton, and remains a crucial part of the aquatic food chain....

This video covers:

- The idea that objects can absorb and emit energy in the form of radiation, and that this can affect their temper
ature
- What determines which type of radiation
is emitted
- Wavelength-in
tensity...

This video answers:

- What is red s
hift?
- How did we discover
red shift?
- Why is sp
ace stretching
- Why is th
e universe expanding
- How to we know t

he universe is expanding


Exam board specific...

This video covers:

- Why objects appear the colour th
ey do
- What happens when light is absorbed, reflected and tr
ansmitted
- What makes objects appear opaque, transparent an
d translucent
- How

colour...

This video covers:

- What flame emission spectroscopy (also called flame photometry
) is.
- How it can be used to identify the metal ions present in
a sample
- How it shows the concentration of each metal ion...

In this fun animation, you will learn how light behaves when it passes through a coloured filter. The video uses different coloured sunglasses to explain that coloured filters allow only certain colours of light to transmit through them....

Chameleons don’t change their color for camouflage, as most people think. They can’t perfectly match your crazy pink curtains or blend into your blue couch. As much as Pascal from Disney’s Tangled might change his colors on whim, alas,...

A black body is a theoretical or imaginary object that perfectly absorbs all incoming electromagnetic radiation, and also emits radiation, like heat and visible light, based on its temperature. A black body is considered theoretical...

This video will explain the electromagnetic radiation spectrum, what it is, and how it can be used to observe space objects.

Characteristics of a Wave explores the characteristics of a wave by defining the terms wave, amplitude, crest, trough, wavelength, and frequency.

Photosynthesis analyzes the process of photosynthesis by describing how cells and organisms acquire and release energy.

In this video, we explore why the sky looks blue and the sun looks yellow. We learn about the concept of Rayleigh scattering and how it interacts with the atmosphere to create this phenomenon. We also discover why the sun appears red or...