which materials can l use if l want to use length wave 680 to 900 in hplc

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Explain the use of gear pumps in motor?

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i want pattern of ONGC Written examination

13 Answers   IOCL, ONGC, Reliance,

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Explain under what circumstances are vortex flowmeters the most accurate?

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i am a student of thapar university final year.can anybody please help me with the exam pattern of the companies:engineers india ltd. ; iocl ; UOP, HPCL. If psbl plz send me the previous years questions on this email id k_arora1987@yahoo.com. i d be really greatful

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Question 102 - (a) As an approximation, let v = Zc / 137 where v is the radial velocity for 1 s electron of an element, c is the speed of light, Z is the atomic number. For gold with Z = 79, find the radial velocity of its 1 s electron, in term of c and percentage of the speed of light. (b) As an approximation, let A x A = 1 - Z x Z / 18769 where A is the ratio of the relativistic and non-relativistic Bohr radius. Find the value of A.

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is petroleum a mixture of hydrocarbon?

5 Answers  

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Explain about different types of lamps?

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What information is needed to specify a mixer?

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How can I remove/decrease TDS from sewage waste water? At the moment it is 900gm/l. What is recommended TDS level to dispose sewage water in sea?

2 Answers   OGDCL,

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What are the applications of screen analysis in the chemical industry?

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Explain the process of including heat exchangers in ammonia refrigeration system?

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