This is a video of DALF C2 speaking test in exam condition with a candidate and two examiners. This video presents the three parts of DALF C2 oral production: followed monologue: presentation of the document (1st part), followed...

In this video Paul Andersen explains how the wave speed measure the speed of a wave through a medium. The medium determines the speed of the wave. The velocity of the wave is equal to the product of the wavelength and the frequency of...

The equation for the harmonic frequencies of stringed instruments is derived. Harmonic numbers and fundamental frequency are defined. A guitar is used to demonstrate harmonic numbers.

Learn some German vocabulary while Herr Antrim recalls his favorite April Fools' Day jokes of all time. <b<b<b<b<b<b<b<b<b<b<b<b<br/>r/>r/>r/>r/>r/>r/>r/>r/>r/>r/>r/>r/>

What are isonitriles good for? The Passerini reaction! This is a very neat multi-component reaction that is good for generating chemical libraries. When was it invented? What's the mechanism? What are we doing with it today? Let's find out!

The video explains the concept of redshift and blueshift in the context of galaxy movement and how it relates to the shift in wavelength of light emitted by a galaxy. The video then shows how to use an equation to calculate the shift in...

The relationship between wavelength and frequency is determined. The number of waves, wavelength, and wave speed at each standing wave frequency is determined. The wave speed is measured independent from the standing waves.

This video discusses the properties that all waves have in common, including amplitude and wavelength. It also demonstrates how to calculate the speed of a wave using the equation v = Fλ, where v is the wave speed, F is the frequency in...

Scientists use satellite data to peer into the massive storm – learning how and why it changed throughout its course.



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Award Winning Short Film. Learn how the body and brain function, observe how we can dispel the stigma of mental health and see how your mental health impacts a community. This highly sensitive suicide prevention film contrasts how...

Beta Oxidation 2

This video features a marine biologist who shares her experiences in collecting venomous stonefish, communicating science to the public, and discovering sea slugs. She also talks about the impact of plastic pollution on marine life and...

Upon viewing the Light video series, students will be able to do the following: List some of the reasons light is important to all living things. Understand that light is a type of energy. Describe how light behaves both as a wave and as...

The equations for the harmonic frequencies of open and closed pipe wind instruments are derived. An animation of a longitudinal standing wave pattern in a closed pipe is shown. Displacement and pressure nodes and antinodes are shown.

This video provides an introduction to the speed of sound in air and demonstrates several methods to measure or calculate it. It also presents equations to calculate the speed of sound based on the wavelength and frequency of a sound...

In this video Paul Andersen explains how the wavelength of a standing wave is determined by the boundary length and frequency of the wave. The fundamental frequency has a wavelength double the boundary length. Harmonics are built on...

In this video, the topic of food security and its various factors affecting food supplies are discussed. The narrator explains that having enough food to feed a population, especially when population numbers are rising, is important for...

The pandemic has been a massive catalyst for change for brands. Ukonwa Ojo, Amazon Studios' CMO, looks at the tone brands should strike and how Amazon intends to navigate the streaming wars as lockdowns ease.

Howcast - Learn how to say "how far is that" in Italian with this Howcast video.

All the light that we see are electromagnetic waves. All different wavelengths are equivalent, except that waves of higher frequencies are more energetic. The speed of all these EM waves, however, is the...

Howcast - Learn about the top five neighborhoods to visit on a trip to Rome, Italy in this Howcast travel video.

How to make a lava lamp at home! Easy science experiments for kids with Steleo!

Alcubierre warp drive - faster than light travel? Is Warp speed possible? Enterprise from Star Trek can go 9000 times the speed of light. By comparison, the fastest manmade object, the Juno probe goes 0.0002 times...

This video explains how to conduct an experiment to determine the speed of a wave on a string. It shows the steps involved, such as setting up the string or wire, creating a wave on it, and adjusting the distance between the two ends to...