Why Iceland is Greeny?

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Greenland: The Icy Giant at the Center of a Warming World Why Iceland is Greeny?           Far beyond the reach of most people’s daily thoughts lies Greenland, a vast and remote Arctic island that is quietly becoming one of the most geopolitically, environmentally, and economically important places on Earth. Though it’s part of the Kingdom of Denmark and home to fewer people than a small European microstate, Greenland’s immense landmass, strategic location, and untapped wealth have made it the subject of increasing global attention. A Vast and Frozen Land           Greenland is the largest island in the world, more than three times the size of France. With a population of only 56,000, it's one of the most sparsely populated places on Earth. Roughly one-third of the population resides in Nuuk, the capital, while the rest is spread across coastal settlements. Almost no one lives inland and for good reason: roughly 80% of the ...
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How do Earphones work? The Physics of Sound in Earphones.

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How do Earphones work? The physics of Sound in Earphones:

Introduction:

            Initially speakers, and now earphones and headphones, allow us to relish music almost constantly, anytime, and anywhere.  Speakers, one can easily agree, are deplorable in public places and the preference in such cases is earphones.  Your device houses an orchestra, and earphones funnel the music straight into your ears.  A private concert just for you.  A pair of earphones or headphones is simply two speakers that are placed extremely close to your ears, except that they are incredibly small that it impeccably fills an ear's outer void.  For this reason, they are also - although quite seldom - referred to as ear - speakers.

Headphones
Headphones

Transducer:

            A transducer is a device that converts energy from one form into another.  A pair of earphones is composed of two transducers that convert the electrical energy produced by your device into sound energy that our ears perceive as music.  Basically, each earphone is just like any other circuit - a conductor drawing current from a battery (source) and providing it to a load (transducer).

The Jack:

            The conductor is connected to the source with what is called the jack of the earphone.  The stout, shiny needle plunged into your device is three metal contacts stacked one on top of the other, each separated by a layer of insulation.  The tip of the needle is called, well, the tip, the contact in the middle is called the sleeve and the uppermost contact is called the ring.  For this reason, the jack is formally called the TRS (Tip, Ring and Sleeve) connector.

Earphones
Earphones

            The tip forms the contact for the wires that power the left earphone, the sleeve forms the contact for the wires that power the right earphone, and the ring forms the contact for the wires that form the common ground.  However, certain jacks are divided into four parts.  The fourth contact is found in those earphones that also comprise a microphone.  The fourth metal forms the contact for the wires that power the microphone.

Connection:

            Recall that each earphone is a circuit, and a circuit cannot exist as a single wire emanating from the battery.  The circuit cannot be complete unless the conductor returns to the battery.  Therefore, each earphone comprises two wires -- one that connects the source to the transducer, and another, the ground, that completes the circuit.  While in a speaker you'd find the two ground wires to be separate, the grounds in a pair of earphones are entwined into a single wire, the common ground, which is connected to the ring.

Earphones
Earphones

            The wires are insulated with a plastic coating that is often adorned with designs to make them aesthetically appealing.  The plastic that insulates the jack not only purports to ensure safety, but also to provide a grip to facilitate the insertion and removal of the jack.

Working:

            Each conductor coiling around its cone becomes an electromagnet when supplied with current.  Music is an oscillatory signal. The force causes the polarities, exert a force on each other.  The force causes the diaphragm attached to the coil to move, which causes the air in its vicinity to vibrate.  And what is sound but the vibration of air molecules?

            The sound exits through a grill that is suffused with holes.  The holes are large enough to allow the music to exit, but small enough to prevent dust and earwax from entering the earpiece and damaging the equipment.  As it is the grill that is ultimately in contact with the ear, it is ensured that it's soft and comfortable.

Headphones
Headphones

            Today, earphones, to insulate the music from the surrounding noise, and endowed with circuits that enable them to actually cancel noise.  Also, earphones or headphones are now losing their wires.  Wireless pieces entail absolutely none of the unavoidable tangling and untangling that so many people loathe about their earphones.  The operation is the same: a moving diaphragm vibrates the surrounding air.  The signals to the coil, however, are propagated wirelessly, which it detects with a wireless sensor. 

            Phones today, jumping on Apple's bandwagon, don't even have slots for jacks anymore.  The future truly is wireless Lastly, no one can deny that earphones are a marvellous invention.  With the increasing sophistication of audio technology, sound quality is now reaching its zenith.  Music is stimulating, but, biologically, nothing trumps socialising.

Causes: 

            A more immediate cause of worry is the loss of hearing caused by earphones.  High volumes are known to cause hearing impairment and even total deafness.

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