Knowledge N Fact4u

Why do diamonds last forever ? •Diamonds do not last forever. Diamonds degrade to graphite, because graphite is a lower-energy configuration under typical conditions. •Diamond (the stuff in wedding rings) and graphite (the stuff in pencils) are both crystalline forms of pure carbon. •The only difference is the way the carbon atoms are arranged and bonded in the crystalline lattice. •In diamond, each carbon atom is bonded to four neighboring carbon atoms in a closely-packed three-dimensional grid. •In graphite, each carbon atom is strongly bonded to three neighboring carbon atoms in a plane and the planes of atoms are loosely bonded to each other. •The degradation of diamond to graphite is a simple case of the atoms internally rearranging and relaxing to a lower energy state. This process requires no chemical reaction with an external material. •Although graphite is a more stable form of crystalline carbon than diamond under normal conditions, there is a significant kinetic ...

Even the clearest of recordings are useless without a good loudspeaker  The modern loudspeaker, as demonstrated by the Monitor Audio Apex series, produces sound by converting electrical signals from an audio amplifier into mechanical motion, from which sound waves emanate. Loudspeakers can consist of an individual transducer (audio driver) or a series of drivers encased within a large chassis, each dealing with a certain frequency band to improve the overall gamut and fidelity of reproduced sounds. For example, larger subwoofer speakers deal with low frequencies, while smaller speakers called tweeters deal with high frequencies. These various drivers are controlled by a filter network, which organises the different frequency signals coming from the amplifier and directs them to the driver most suitable to deal with it. The construction of a single loudspeaker driver is a complex process, the central element of which is a concave plastic or paper conical disc. This i...

How do carrots help you see in the dark ? •Carrots do not help you see in the dark. Carrots do provide Vitamin A (in beta-carotene form)which is used by your body to maintain normal eyesight. •But eating excess Vitamin A does not lead to better-than-normal eyesight.  •Most Americans get sufficient Vitamin A in their diet and therefore have the best eyesight that carrots can provide.  •This myth was created by the British during World War II to hide a secret weapon, according to the book " The Invention That Changed the World " by Robert Buderi. •During the war, the British Royal Air Force had been intercepting night-time Nazi air attacks at surprisingly good rates.  •In an effort to conceal the secret weapon that was giving them such success, the British pretended their high night-time spotting rates were a result of their pilots eating large quantities of carrots.  •The real cause of their success was a then cutting-edge technology known as radar...

Why doesn't the planet Uranus explode if it contains so much hydrogen and methane ? •The planet Uranus indeed contains a significant amount of hydrogen and methane, both highly flammable gases. •However, the burning of methane or hydrogen requires oxygen. Simply but, there is no free oxygen on the planet Uranus.  •On earth, we are so immersed in oxygen that we tend to take it for granted. Many chemical reactions that require oxygen seem to just happen automatically on earth: metals rust, forests catch fire, and candles burn. •We may be tempted to ignore oxygen's role in a chemical reaction since it seems to be always there.  •But oxygen is not always present. If I place metal in a jar containing only argon, it will not rust. If I place a lit candle in a jar with no oxygen, its flame will go out.  •There is an easy demonstration you can do at home to convince yourself of this fact.  •Get a bowl and fill it about a quarter full with bakin...

Why is the sky not blue as seen from space ? •The daytime sky is indeed blue as seen from space. Look closely at any color-accurate photograph of earth taken from space and the blue tint of everything on the day side is unmistakable. This blue tint is the sky. •The daytime sky as viewed from space is not a solid, uniform blob of blue for two reasons: (1) there are white clouds in the sky which can be seen just as well from space as from earth's surface, and (2) the sky is not opaque. •Earth's atmosphere consists mostly of nitrogen molecules and oxygen molecules bouncing around as a gas.  •Air is close to perfectly transparent. It's a good thing, because the transparency of air is what allows you to see your computer screen and breath at the same time.  •However, air is not perfectly transparent. A very small amount of the light that passes through air is scattered in all directions instead of being allowed to continue traveling on in the forward directi...

Hello everyone, here we are going to talk about Swiss Bank. When a person hear the name of this bank the only thing that come to our mind is Black Money. When any kind Fraud occur we hear the name of Swiss Bank and Government also tell that he is going to bring all the black money from Swiss Bank. Swiss Bank is located  in Switzerland and was established in 1872 as Basler bankverein. According to Switzerland banking law bank officials cannot disclose the name of account holder name unless and until Swiss court order them. Swiss court give the order only when there is a criminal charge on account holder name for example money laundering, fraud etc. The account in Swiss Bank are secretive account. Anyone who open a bank account in Swiss Bank he has to complete his KYC as normal bank do. But they never reveal the identity and address of account holders name. The account is in coded digits. In bank statement the account holder name is also not disclosed to any one. Here Swi...

Does the back of a rainbow look the same as its front side ? •A rainbow does not have a back side. If you were to walk completely to the other side of the mist cloud that is creating the rainbow and turn around, you would not see a rainbow.  •You have to realize that a rainbow is not a stationary physical object. Instead, it is a pattern of light that becomes a stable image only when you look at it from the right angle.  •You may not have noticed it, but every time you look directly at the center of a rainbow, the sun is directly behind your head. This is the only angle at which the light pattern that constitutes the rainbow can enter your eye and therefore lead you to see it. •The sun is always in the opposite part of the sky from the center of the rainbow. This is because a rainbow is actually just sunlight which has been refracted and reflected.  •Refraction occurs when the sunlight enters and leaves the small spherical water droplets that co...