Sound is created by vibrations that travel in waves, with the longer, more spread out waves being lower pitched sound, and shorter, closer together waves being higher pitched sound. Sound waves travel through the air or water (or whatever is in their way) to reach your ear and vibrate your eardrum, which in turn lets you hear.Sound can not be heard in space because there is no air for it to travel on. Volume is measured in decibels, with a pin drop at about 15 decibels, a 12-gauge shotgun being at about 160 decibels, and a normal conversation at about 65 decibels.
Ernst Chladni was the first scientist to clearly prove that sound travel through sound waves. He was a german scientist and musician, and he studied the science of sound. In the 18th century he showed how moving a violin bow on a metal plate, now called Chladni, with sand on it made the sand move to the places where the Chladni wasn’t vibrating. A Chladni is a metal plate with sand on it and when there is certain vibrations, the sand moves to the place with less or no vibrations creating a pattern.
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Ernst Mach described how shock waves worked, which lead to give aircrafts the speed of sound.
Flying the speed of sound is flying at Mach 1, and flying twice the speed of sound
FUN FACTS about sound waves:
Its takes about 12.9 days for sound from earth to reach the moon
Sound cannot travel through a
vacuum Sound travels 4 times more than air Dolphins can hear sound underwater about 24kms away Sources: Sound as a Longitudinal Wave:(The Physics Classroom) 2015 Making Sound Waves Visible: Exploring Chladni Plates( ScienceNetLinks)
In 1906, a scientist by the name of Richard Dixon Oldham had suggested a theory structured another scientists findings by the name of Emil Wiechert. Oldham had identified that S waves and P waves behaved differently and
Hearing allows us to take in noises from the surrounding environment and gives us a sense of where things are in relation to us. All those little folds on the outside of the ear, called the tonotopic organization, make it so sound waves in the air are directed to the ear canal, where they can be further processed. Once in the ear, the sound waves vibrate the ear drum, which tell the ear exactly what frequency it is sensing. The vibration of the ear drum is not quite enough to send a signal to the brain, so it needs to be amplified, which is where the three tiny bones in the ear come into play. The malleus or hammer, incus or anvil, and stapes or stirrup amplify this sound and send it to the cochlea. The cochlea conducts the sound signal through a fluid with a higher inertia than air, so this is why the signal from the ear drum needs to be amplified. It is much harder to move the fluid than it is to move the air. The cochlea basically takes these physical vibrations and turns them into electrical impulses that can be sent to the brain. This is...
This may happen unconsciously, as is usually the case with soft background noise such as the whoosh of air through heating ducts or the distant murmur of an electric clothes dryer. Sometimes hearing is done semi-consciously; for instance, the roar of a piece of construction equipment might momentarily draw one's attention. Conscious hearing, or listening, involves a nearly full degree of mental concentration. A familiar instance in which listening takes place would be a casual conversation with a friend or colleague. In such cases, the sound waves entering the ear are transferred to the brain, which then
If you put your finger gently on a loudspeaker you will feel it vibrate - if it is playing a low note loudly you can see it moving. When it moves forwards, it compresses the air next to it, which raises its pressure. Some of this air flows outwards, compressing the next layer of air. The disturbance in the air spreads out as a travelling sound wave. Ultimately this sound wave causes a very tiny vibration in your eardrum - but that's another story.
Heppenheimer, T. (2001). A Brief History Of Flight: From Balloons to Mach 3 and Beyond. Canada: John Wiley & Sons, Inc.
The cylinder phonograph proved to be successful, but the problem with the machine was that the tin foil only allowed a few uses. With the help of another great inventor, new advances could be made to improve this invention. The inventor of the telephone, Alexander Graham Bell, had set up a laboratory for his cousin, Chichester Bell and Charles Tainter. Bell a...
Noise is ubiquitous in our environment. (Pediatrics , 1997) It is undesirable sound, unwanted sound. Sound is what we hear. It is vibration in a medium, usually air. Sound has intensity, frequency and duration. The ability to hear sounds at certain frequencies is more readily lost in response to noise. (Pediatrics , 1997). The further you are from sound the less effect you hear it but the more closer you are to sound the louder it is.
1- N-wave: the sonic boom is formed by aircraft flying straight and at constant speed.
Travelling at a speed twice that of sound might seem to be futuristic; however, this feat was already achieved almost 40 years ago by the world’s only supersonic passenger aircraft, the Concorde. Concorde brought a revolution in the aviation industry by operating transatlantic flights in less than four hours. The slick and elegant aircraft with one of the most sophisticated engineering was one of the most coveted aircraft of its time. However, this was all destined to end when Air France Flight 4590 was involved in a tragic disaster just outside the city of Paris on July 25, 2000. The crash killed 113 people, but more disastrous was its impact.
A young astronomer by the name of Francis Drake agreed with the theories of Cocconi and Morrison. He proposed building a radio receiver in order to listen for waves of sound being transmitted through space. It wasn't until the spring of 1960 that Dra...
The Scholar: I think that's more a function of sound wave vibration than anything else.
...Another way to decrease the disturbance over the wings are to move the wings lower than the horizontal stabilizer or visa versa to allow the shock waves moving over each wing to miss each other. Most aircraft today do not have enough fuel to maintain the speed of sound for great distances. Engineers have designed a brand new aircraft known as the F-22, which has the ability to fly an entire mission at supersonic speeds. The speed of light is unattainable by aircraft due to drag. We have no materials that could with stand the heat caused by the friction of the air moving over its body, nor materials strong enough to be able to take the enormous drag. Today there is no thrust capability that would allow for the speed of light. Although aircraft has proved such things as time dilation it is still impossible for an aircraft to travel at 900,000 miles per second.
There are three things that your ear does in order to receive sound; Send the sound into the hearing part of the ear, Sense the deviation in the air pressure then finally translate these deviation’ into electrical signals that your brain can actually understand.
Hearing is known to be an automatic function of the body. According to the dictionary, hearing is, “the faculty or sense by which sound is perceived; the act of perceiving sound,” (“hearing…”). Hearing is a physical and involuntary act; therefore, unless one is born with a specific form of deafness, everyone has the natural ability to hear sounds. Sounds constantly surround us in our everyday environments, and because we are so accustomed to hearing certain sounds we sometimes don’t acknowledge them at all (or “listen” to them). The dictionary definition of listening is, “to give attention with the ear; attend closely for the purpose of hearing,” (“listening…”).
Produced sound from speakers has become so common and integrated in our daily lives it is often taken for granted. Living with inventions such as televisions, phones and radios, chances are you rarely ever have days with nothing but natural sounds. Yet, few people know the physics involved in the technology that allows us to listen to music in our living room although the band is miles away. This article will investigate and explain the physics and mechanism behind loudspeakers – both electromagnetic and electrostatic.