Sounds can change as they move from one medium to another. Under the right circumstances the effect is surprising and extreme. Physics - Waves - Learning Points. Sound is a wave that is created by vibrating objects. Every object has a...

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...

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...

How fractions are used in music – and Pythagoras built a whole musical scale based on fractions! Maths - Number A Twig Math Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts...

How our ears hear different frequencies, and how they work with the brain to turn these into sounds which we understand. Biology - Being Human - Learning Points. Sounds are simply movements of air molecules. Our ears are extremely...

A demonstration of how hi-fi speakers use a clever combination of electronics and magnetism to convert electrical impulses into sound waves, which our brain then interprets as music. Physics - Electricity And Circuits - Learning Points....

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 create a polymer using cornflour and water called oobleck. Oobleck is a non-Newtonian liquid that behaves like a solid and a liquid. When placed on a speaker, the vibrations cause the polymer to constantly change its behaviour and it...

We look at how a vacuum affects how sound travels. An alarm is set off and placed under a bell jar. The air is removed from the jar to create a vacuum. We can still see the hammer of the alarm clock moving, but cannot hear the sound....

We create a Rubens\u2019 Tube to demonstrate the movement of sound waves. A tube lined with holes is filled with propane and connected to a speaker. We light the gas coming from the holes and play different frequencies and volumes of...

Born out of research into RADAR in World War Two, ultrasound has become one of the most important medical inventions. What is it, and how does it work? Biology - Being Human - Learning Points. Ultrasound was developed by Ian Donald in...

What are the properties of magnets, and why are they useful to us? Physics - Electricity And Circuits - Learning Points. A permanent magnet is a piece of metal that possesses a magnetic field. The magnetic field is strongest at the...

Sounds travel in waves.
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The world around us - Light and


sound - Sound />

Learning Points
Sounds are made by


tiny movements called vibration
s

.


Sound energy travels in...

Find out how musicians tune their instruments.
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Physical processes - Sound -
C

hanging pitch />

Learning Points
Pitch depends on the frequency of sound waves


– the number of waves per...

Find out about infrasounds – sounds that are too low-pitched to be heard by humans.
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Physical processes -Sound -
C

hanging pitch />

Learning Points
Infrasounds are
t

oo low-pitched for...

Find out why there is no sound in space.
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Physical processes -Sound - How does


sound travel? />

Learning Points
The vibrations o
f

vocal cords produce sound waves.


On...

Find out that sound waves always need a medium to travel through.
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Physical processes - Sound - How does


sound travel? />

Learning Points
Sound wav
e

s are known as compression waves.
...

Fascinating insight into the sonic boom created when a jet plane breaks the sound barrier.
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Physical processes -
S

ound - Volume />

Learning Points
The spee
d

of sound in air is about 343...

Discover how techniques for mapping the seas have changed throughout history.
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People and places -Mapping - Ma
p

ping the seas />

Learning Points
The technique of measuring the sea's depth...

Las ondas transfieren energía de un lugar a otro y pueden describirse en términos de frecuencia, longitud de onda y amplitud. Este video explica cómo las ondas se clasifican en transversales y longitudinales, dependiendo de cómo vibran...

इस वीडियो में हम ध्वनि की गति को प्रभावित करने वाले कारकों पर चर्चा करेंगे। हम जानेंगे कि ध्वनि हवा में लगभग 340 मीटर प्रति सेकंड की गति से चलती है और यह गति तापमान और हवा के दबाव के अनुसार कैसे बदलती है। ठोस पदार्थों और तरल...

इस वीडियो में हम तरंगों के दो प्रमुख प्रकारों—अनुदैर्ध्य और अनुप्रस्थ तरंगों—का अध्ययन करेंगे। तरंगें ऊर्जा को एक स्थान से दूसरे स्थान तक ले जाती हैं। अनुदैर्ध्य तरंगों में कण उस दिशा में कंपन करते हैं जिसमें ऊर्जा यात्रा कर रही...

Are you curious about how hearing works? From the sound waves entering to the tympanic membrane vibrating, to the malleus, incus, and stapes doing their job, all the way to what happens in the...

Video 5 of the Echolocation Unit. This segment transitions from bats to human technology by explaining how sonar was developed as a form of echolocation to help ships, especially submarines, navigate in the dark depths of the ocean....