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Moment of truth
The fastest man-made object that ever leave the Earth is the New Horizon spacecraft, launched in January 2006, and attained a speed of more than 36000 mph.

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becquerel Metro.
An SI unit that is used in nuclear physics to measure the activity (number of disintegrations per second) of a radioactive source. It has a symbel Bq and named after Antoine H. Becquerel (1852-1908). 1 Bq = one disintegration per second. However, the measurement does not contain information about the nature of the radioactive source, nor the types of radiation. See also curie

bel Elec.
A unit measure of ratios of power levels, use in acoustic, electronic and telecommunications. It was first coined in the early 20th century in honour of Alexandra Graham Bell, the inventor of telephone. The bel is a base-10 logarithmic measure. It is more commonly describe is decibels (dB) where 1 bel = 10 dB.

Benedict's reagent Chem., Biochem.
A reagent that is used to test for the presence of reducing sugar. The reagent is prepared by adding copper(II) sulfate to a solution mixture of sodium citrate and anhydroups sodium carbonate. A test solution is then added to the reagent and boil. A red-brick precipitate of copper(I) oxide will form if the test solution contains reducing sugars such as fructose and glucose.

beneficiation Min. Ext.
A process of separating ore into the valuable components and the waste component. The former component is then ready for further refining such as smelting. The process is also called ore dressing or mineral dressing. This may achieve by several process, depending on the type and nature of ore, such as crushing, grinding, froth flotation and even magnetic separation.

beta decay Phys.
Radiation involves emission of an electron and an antineutrino by change (decay) of a neutron into a proton at the atomic nucleus. The decay process conserves the electron charge and lepton number.

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