June 17, 2015
Ultraviolet light is everywhere! Every month, science makes new discoveries based on UV rays. We’re still learning how our eyesight works, what UV light can do to our skin, how UV radiation varies from planet to planet… and much more.
This selection of noteworthy articles is bound to “brighten” any classroom discussion on light and the UV light spectrum. Read on! Read the rest of this entry »
Leave a Comment » | College level, Elementary level, energy, High School level, Middle School level, Physics | Tagged: DIY, Educational Innovations, experiments, frequency, hands-on activity, homeschool, light, parent friendly, PBL, phenomenon based learning, phenomenon-based science, science, science fair project, ultraviolet | Permalink
Posted by Donna Giachetti
January 10, 2014
The Chinese Spouting Bowl
by Ted Beyer
When we are at one of the many educational shows we attend each year, teachers often ask what our favorite products are. I always point at two items – our eddy current materials (here’s that post!) and The Chinese Spouting Bowl. When I mention the bowl, invariably I hear – “yeah, I have seen that in the catalog – does it really work?” The simple answer is yes, yes it does. It not only works, it is amazing to see work, not that hard to make work, and most importantly, it can also be a powerful teaching tool. In fact, the Chinese Spouting Bowl is an ancient and fascinating object that can bring many different science scientific principals into the classroom in an unexpected way.
Leave a Comment » | energy, High School level, Middle School level, Physics, sound | Tagged: amplitude, anti-nodes, Chinese Spouting Bowl, frequency, nodes, PBL, phenomenon based learning, phenomenon-based science, resonance, science, sound experiments, sound waves | Permalink
Posted by Tami O'Connor
June 9, 2012
by: Michelle Bertke
Sound can be a difficult concept to portray because the sound waves cannot be seen or touched. Luckily, there are several at home experiments that demonstrate the properties of sound waves.
Water tank to show ‘Sound Waves’
You can use a fish tank half filled with water to give a visual demonstration of ‘sound waves’. Water is a perfect medium to show the propagation of waves. This demonstrates how sound waves travel though the air. There are two ways to display this activity. One way is to simply press your hands onto the top of the water and allow the waves to be made by the pressure of your hand. This allows students to see how waves travel though a medium. You can also use this to point out the aspects of a wave such as frequency and amplitude. Another way to show waves is to place a speaker next to the tank and allow the sound to produce the waves. This can show that sound is a form of pressure just like your hand. Read the rest of this entry »
Leave a Comment » | Elementary level, energy, experiments | Tagged: frequency, PBL, phenomenon based learning, phenomenon-based science, pitch, properties of sound, science, sound experiments, sound waves, tone, vibration | Permalink
Posted by Tami O'Connor
May 21, 2010
by: Martin Sagendorf
An Odd Name: They’re named for the German physicist Ernest Chladni who popularized them in the mid-1700s. His name is pronounced: kläd’nêz.
Chladni Plates are: Thin plates (sprinkled with fine particles) vibrated perpendicular to their plane.
How? – Then and Now: Long ago Chladni used a cello bow to excite the edge of a thin metal or wooden plate. Today, we can use an oscillator, amplifier, and an electro-mechanical oscillator. We have a great advantage, we can easily vary the frequency of excitation thereby providing a whole vista of experimentation.
A 17 in. x 14 in. Chladni Plate in guitar shape at 200 Hz
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7 Comments | College level, experiments, High School level, Middle School level, Physics | Tagged: construct your own physics demonstrations, energy, Ernest Chladni, frequency, oscillator, resonance, sound, standing waves, vibration | Permalink
Posted by Tami O'Connor
January 8, 2010
by: Norman Barstow
Frequency, Wavelength and Pitch:
Sound is a tone you hear as the result of regular, evenly spaced waves of air molecules. The most noticeable difference is that some tones sound higher or lower than others. These differences are caused by variations in spacing between the waves; the closer the waves are, the higher the tone sounds. The spacing of the waves – the distance from the high point of one wave to high point of the next one – is the wavelength.
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8 Comments | Elementary level, experiments, Middle School level, Physics | Tagged: frequency, parent friendly, pitch, sound, tone, vibration, wavelength | Permalink
Posted by Tami O'Connor