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Is a Mexican wave as seen among the crowds at some sporting events a transverse wave or a compression wave?
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What is a sonar cannon?
A sonar cannon is a tool that is used to create a noise that is painful to crowds of people or even to animals. These cannons are sometimes also used to explore for oil under the ground by bouncing sound waves off of bedrock seeking holes in the rock.
Does the periscope use reflection or refraction?
Yes! Actually it is determined by how the periscope was made. The cheap ones often sold around parades and large crowds are made of cardboard and mirrors, using reflection to provide a view. More sophisticated devices in submarines and tanks will use prisms to bend the light, using refraction to change the direction of the light and provide magnification.
Why do wesay that the lungs work like a train station?
Very interesting analogy, although perhaps taking a bit of imagination. Perhaps a subway station would be a better analogy. I'm thinking of the capillaries being trains, perhaps the Red blood cells being the train cars. The alveolar/capillary walls and the pores of Kohn would be the doors. The Alveoli would be the walkways. Air being crowds of people milling about. As the RBC's pass by, the Carbon Dioxide gets off the train, passes through the capillary walls and into the alveoli joining the crowds of "air" milling about, while oxygen passes the other way. I believe it is all a passive process. So the boarding / deboarding is only a will to go where fewer Oxygen or Carbon Dioxide molecules are. And in theory it could be two way with excess oxygen getting off, and perhaps reboarding. And Carbon Dioxide getting off and back on too. But, in general, more carbon dioxide gets off and more oxygen gets on.
What are the disadvantages of a reflecting periscope?
The main disadvantage is that it does not have the advantages of a prism periscope. 1) Glass prisms do not produce multiple reflections 2) Glass prisms do not have exposed silvered surfaces which can be damaged 3) Depending on your arranges, if not the image will not be inverted.
What is infrasound?
Infrasound is audio frequencies below the level of human hearing at 20Hz (Hertz) Infrasound can be found right through nature, from Thunderstorms, being next to a stormy beach, Volcanic erruptiopns, Atomic weapons, Wildlife, to faulty electrical equipment: It is in fact a deep base rummble or hum. Other sources of infrasound include earthquakes, pounding surf, waterfalls, calving of glacial ice, tidal waves, aurora borealis (0.1 - 0.01 Hz), solar flares, solar winds, hurricanes, thunderstorms, the jet stream (30-40Hz),winds in caverns (20-30 Hz.), etc. Infrasound is still a new science and the effects on the human body are still not understood. Severe damage can be cause when the audio frequency matches that of the human body: During world war II, Adolf Hitler's engineers used infrasound to stir up anger in the large crowds that had gathered to hear Hitler. The result was a nation filled with anger and hatred and experimented with a weapon that would kill the enemy, just by sound (Song, Kate Bush) Experiment Iv lyrics)) Currently the US Government tried to invent similar equipment during the Gulf war (was actually just loud Heavy metal) In Nature, It has been known that certain whiles are able to stun their prey with powerful blasts of inaudible sounds. Called 'gunshots,' whales focus these powerful blasts at large squid and other fish to paralyze and catch them. In some instances, they have been known to burst their prey apart by tonal projection alone." Even though you cannot hear infrasound, it's effects can be felt. These range from feeling uneasy, to being watched, to actually seeing things that are not there: Certain Paranormal investigators look at Infrasound as a possible explanation for Paranormal events. Man-made structures, such as engines, cars, buses, trains, motorcycles, and airplanes also produce infrasound. John Cody also noted that pilots exposed to infrasonic vibrations of jet chassis experience a reduction in "vision, speech, intelligence, orientation, equilibrium, ability to accurately discern situations, and make reasonable decisions." Studies show the different ways in which infrasound affects the human body. As infrasound pitches, or cycles per second, decrease, deadly effects on the body increase. Infrasound disrupts the normal functioning of the middle and inner ear, leading to nausea, imbalance, impaired equilibrium, immobilization, and disorientation. Exposure to even mild doses of infrasound can lead to illness. Increased intensities of infrasound can result in death.These are a few examples of low frequency and their effects: 12 Cycles Per Second (Hz) - Walt Disney and his artists accidentally experienced infrasound on one occasion. A cartoon sound effect was slowed from 60 cycles per second to 12 cycles per second via a tape-editing machine and was amplified through the theater system. The resulting tone, though brief in duration, produced in the entire crowd nausea that lingered for several days. 1 - 10 Cycles Per Second (Hz) - "Lethal infrasonic pitch lies in the 7 cycle range. Small amplitude increases affect human behavior in this range. Intellectual activity is first inhibited, blocked, and then destroyed. As the amplitude is increased, several disconcerting responses have been noted. These responses begin a complete neurological interference. The action of the medulla is physiologically blocked, its autonomic functions cease." (source; the Sonic Weapon of Vladimir Gavreau, by Gerry Vassilatos) 7 Cycles Per Second (Hz) - The most profound effects at this infrasonic level occur here. Seven Hz "corresponds with the median alpha-rhythm frequencies of the brain. It is also commonly alleged that this is the resonant frequency of the body's organs and hence organ rupture and death can occur at high-intensity exposures." (source; 'Acoustic Trauma: Bioeffects of Sound,' by Alex Davies) ---- There are quite a few websites dedicated to this subject and it's quite easy t oconstruct your own experiments but with caution and guidance as Infrasound although seems harmless.. can be fatal or cause lasting damage to your body and those around you. Sean Devon & Cornwall Paranormal Society.
Why do you get arrested for having a lazar pen?
It is prohibited in certain areas, like around air ports. It can also lead to arrest when used in such venues as sporting arenas and large crowds.
What is the purpose of aerial advertising?
The purpose of aerial advertising is to raise public awareness of a product or service . It is especially effective in places where large crowds gather, such as amusement parks, beaches, or sporting events.
What is annual sporting event attracts the largest crowds every year?
every year is is probably the champion's league final. and overall is the world cup but that is every 4 years.
In Rome huge crowds witnessed sporting events in this amphitheater built around seventy five AD?
The Colosseum.
What is the fear of crowds called?
It actually has three names: Demophobia is the fear of crowds. Agoraphobia is the fear of open spaces and crowds. Ochlophobia is the abnormal fear of crowds.
Why does bernard hate crowds?
why does bernard hate crowds
When was The Wisdom of Crowds created?
The Wisdom of Crowds was created in 2004.
When was Secret Crowds created?
Secret Crowds was created in 2007.
Large crowds lined the street - into passive voice?
The street was lined with large crowds.
What is the ISBN of The Wisdom of Crowds?
The ISBN of The Wisdom of Crowds is 978-0385503860.
How many pages does The Wisdom of Crowds have?
The Wisdom of Crowds has 336 pages.
What is the duration of Idol of the Crowds?
The duration of Idol of the Crowds is 3600.0 seconds.
