Beacon of Maracaibo (also called Maracaibo lightning/Catatumbo lightning) refers to the phenomenon of relentless lightning which goes on for nearly 300 days in a calendar year and for over 9 hours in each of those days. This seemingly...

The buzzing sound that power lines produce is caused by corona discharge. Corona discharge is an electrical discharge that occurs when a fluid (like air) surrounding an electrically-charged conductor becomes ionized. In simple terms, its...

Amplitude Modulation, commonly abbreviated as AM, is a common method of broadcasting radio signals. This method dates back to the 1870s, i.e., the time when we first discovered that information in the form of audio production can be...

The perceived frequency of a sound or musical note.
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The frequency at which a material resonates, or naturally vibrates if given an initial impulse.
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A unit for measuring frequency, equal to one thousand hertz or cycles per second.
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The large vibrations of an object produced when waves matching its natural resonant frequency pass through it.
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The rate at which a repeating event occurs, usually measured in counts per unit time.
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An analogue signal is one in which any variation in amplitude or frequency is continuous.
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An electric current in which the flow of electric charge periodically changes direction.
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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.
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A wave with both magnetic and electrical field components, which oscillate perpendicular to each other.
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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.
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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.
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A technique used by some animals to locate the position of objects around them, by producing sounds and listening to their echoes.
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The SI unit of frequency, one hertz is equal to one cycle per second.
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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.
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The interval between one sound and another that has double the frequency.
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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...

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...

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...

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...

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...

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...