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Kilohertz
A unit for measuring frequency, equal to one thousand hertz or cycles per second. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary...
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Resonance: Vibrations Induced by Matching Waves
The large vibrations of an object produced when waves matching its natural resonant frequency pass through it. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Frequency
The rate at which a repeating event occurs, usually measured in counts per unit time. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
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Analogue
An analogue signal is one in which any variation in amplitude or frequency is continuous. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
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Alternating current
An electric current in which the flow of electric charge periodically changes direction. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
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Doppler Shift: Frequency and Motion
A change in the observed frequency of a wave when it is emitted from a moving object and observed from a stationary point, or vice versa. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images...
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Electromagnetic radiation
A wave with both magnetic and electrical field components, which oscillate perpendicular to each other. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....
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Harmonics
When a musical note is played, we hear the note intended - the fundamental - but also other tones called harmonics that are whole number multiples of the fundamental. A Twig Science Glossary Film. Key scientific terms defined in just 60...
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Eclipse, lunar
An alignment of the Earth directly in between the Sun and the Moon, so that the earth's shadow falls on the Moon and obscures all or part of it. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning...
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Echolocation
A technique used by some animals to locate the position of objects around them, by producing sounds and listening to their echoes. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...
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Hertz (Hz)
The SI unit of frequency, one hertz is equal to one cycle per second. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Eclipse, solar
When the Moon is aligned directly in between the Sun and the Earth, it obscures all or part of the sun to an observer on the ground. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and...
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Octave
The interval between one sound and another that has double the frequency. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Musical Instruments
Different instruments can produce a wide variety of different sounds and notes, but why is this? Revealing how scientific principles combine to make music. Physics - Waves - Learning Points. Musical instruments are designed based on the...
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How Do Mobile Phones Work?
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...
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Beyond Human Hearing
Humans can only hear a certain range of sound frequencies. Discover the sounds we can't hear and why they can be useful. Physics - Waves - Learning Points. The frequency of sound waves determines whether we can hear them. High-frequency...
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Submarine Communication
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...
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Extreme Living: The Frozen North
How the inhabitants of one of the coldest environments on the planet have adapted their lifestyle to survive. Human Geography - Orientation And Settlements - Learning Points. People native to northern Canada, Greenland, Alaska and...
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How Do Lasers Work?
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...
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Waves in Medicine
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...
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The Electromagnetic Spectrum
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...
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Large Intestine
The final chapter in the journey of food through our digestive system: how bacteria transforms undigested matter into waste. Biology - Human Body - Learning Points. The large intestine is around 1.5m long and 6-7cm wide. The large...
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What Are Eclipses?
Solar and lunar eclipses are spectacular phenomena which captivate people around the world, but what causes them? Physics - Our Solar System - Learning Points. A lunar eclipse occurs when the Earth blocks sunlight from reaching the Moon....
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What Makes Up the Electromagnetic Spectrum?
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...