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All kinds of stringed instruments - guitars, pianos, violins - have stretched strings which oscillate when plucked or struck. This oscillation generates sound, which can be amplified acoustically by coupling the vibrations to a large sound-board (for a guitar, the top, and in an upright piano, at the back) or electrically by turning the string oscillations into an electrical signal (using a 'pickup') which can be sent to an electronic amplifier / loudspeaker.

"series of experiments about sound and its application to animals, musical instruments and communications. This unit was designed for use in the second grade. "

loons on Mason Lake and a chorus of birds in Queensland, Australia, thanks to this Mashable link to the free natural sounds archive, now available online from the Macaulay Library at the Cornell Lab of Ornithology. As Open Culture reports, the recordings go back to 1929.

"One of the many ways to get yourself into the sky is to build your own aircraft. This might sounds insane at first: when someone says "I'm going to build my own airplane," it might sound a lot like saying "I'm going to build my own nuclear submarine." But the truth is, homebuilts can be as simple or as complicated as the builder wants, and people of all different backgrounds have built their own airplanes."

Waves of one form or another can be found in an amazingly diverse range of physical applications, from the oceans to the science of sound. Put simply, a wave is a traveling disturbance. Ocean waves travel for thousands of kilometers through the water. Earthquake waves travel through the Earth, sometimes bouncing off the core of the Earth and making it all the way back to the surface. Sound waves travel through the air to our ears, where we process the disturbances and interpret them.

Duxford Spitfire and P-51 Taken at Duxford RAF and USAAC Museum in England. Two of the greatest WWII fighter planes of their era....the American P51 Mustang and the British Supermarine Spitfire. Both planes were powered by the powerful Rolls Royce Merlin engine......which emitted that wonderful sound that became known to many as 'The Sound of Freedom' during the 1940s. Such memories for those of us who were around at the time. P-51 pilot does a great job staying in his position as he has more power and is faster than the spitfire. they must have done a bit of practicing.

"Foster independent thinking and 21st century literacy skills with KQED Media Literacy resources. The ability to think critically about the powerful images, words, sounds, and messages that saturate contemporary culture increases students' chance of success in and outside of the classroom. "

some with sound, some silent 91st Aero Sqn AEF Salmson 2 Reconnaissance 1918 RAF 1940 B-Type Helmet, Mark IIIA Goggle RAF Debrief Spitfire Battle of Britain

"So far the products produced using remote-touch technology, such as hug shirts and kiss phones, may seem creepy, but here's one that sounds helpful instead. The Mobile Lorm Glove, a prototype created by a lab in the University of Arts Berlin, transmits the touch alphabet used by some people who are both deaf and blind, called Lorm. "

""I want you to share my excitement at the discoveries, past and present, which have revolutionized the way we think. From the Big Bang to black holes, from dark matter to a possible Big Crunch, our image of the universe today is full of strange sounding ideas, and remarkable truths. The story of how we arrived at this picture is the story of learning to understand what we see." "

"The following is a collection of almost 200 single concept lessons. These lessons may be freely copied and used in a classroom but they remain the copyright property of the author(s) and the directors of the SMILE program. The Physics lessons are divided into the following categories: Matter, Mechanics, Fluids, Electricity & Magnetism, Waves, Sound and Optics, and Miscellaneous. "

""The Garbage Men" is the name of the band started by 4 Sarasota, Florida teens who not only formed a band, but also created their own instruments using garbage. Hence the name "The Garbage Men". And the music they created using cereal box, water jar, garbage bin cover, pipes etc. sounds really incredible."

"The Voyager 1 spacecraft's 35th anniversary is proving to be unexpectedly exciting, as scientists gathered this week to examine new hints that the spacecraft is on the verge of leaving our solar system. Voyager 1 is now more than 11 billion miles away from Earth. It blasted off in September 1977, on a mission to Jupiter and Saturn. But it also carried a Golden Record filled with music and the sounds of our planet, in case it encountered intelligent life as it moved out toward the stars."

playing with these interactive whiteboad screens (note that you can play them on the computer screen as well, with your child). As Kevin Jarrett says, "The interactives are extremely high quality. The graphics are crisp and clean, the user interface is simple and logical, and the sound effects are pleasing and well thought out." There is a wide range to choose from math, literacy, geography, history, and much more.

"busuu.com is an innovative online community for learning languages. Learn from native speakers: Learn directly from native speakers of the busuu.com community via our integrated video-chat application! By doing so you can practice your language skills in a live conversation. Learn with our material: We have prepared over 150 learning units covering diverse topic areas and grammar units covering the most important grammar points! The content is image and sound-based. Learn for free: busuu.com can be used completely for free!"

"Welcome to The 12th Annual National Storytelling Week Sat 28th Jan - Sat 4th Feb Welcome to the world's widest vistas, in the country of the mind, on the rivers of the tongue. Here is the moment and all time; here time disappears. Come to the place that is... and isn't, more than so many times. Where in the end as light fades on breathe and gathers silence there is only the sound of a sigh and the "Wow" factor."

"Everybody learns better when they are having fun! Here at Quiz-Tree.com you will find educational games and quizzes on many subjects, including Math, Reading, Spanish, Geography, SAT, Spelling, Music and more. All activities come with animated interface, fun sounds and other cool features that make learning more enjoyable. "

"Chemistry | Engineering | The Five Senses | Forces | Life Science | Patterns | Sound | Structures | Water"

July 26, 26 DC-3s took off for a formation flight to EAA AirVenture at Oshkosh. The incredible sound of 52 idling engines was surpassed only by the sight of the airplanes passing overhead, in flights of four. One returned to the ramp with a maintenance problem, another aborted its takeoff because of an engine issue, and a third returned with high oil temperature. The remaining 23 made a grand arrival in Oshkosh with an overhead pass.

Man And Safety - Physical Limitations (1963) - Department Of Defense (( Describes Man's Physical Limitations And Relates Them To Human Error Accidents. Delineates Human Frailties In Movement, Sound, Vision, Balance And Vertigo, Tactile Sensitivity, Perception And Reflexes. Reconstructs Several Accidents To Show The Consequences Of Exceeding One's Physical Capacities.