Knowledge N Fact4u

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...