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What is the diameter of Ragweed pollen?(a) 6 micron(b) 19 micron(c) 14 micron(d) 15 micronThe question was asked by my college professor while I was bunking the class.I would like to ask this question from Transmission of Video Images topic in division Telemedicine Technology of Biomedical Instrumentation

Answer»

Correct choice is (b) 19 micron

Easy explanation: Ragweed POLLEN (19 micron in diameter) and polystyrene LATEX particles (6–14 micron in diameter) seem to meet these requirements. Of the two, polystyrene latex is preferred for calibration purposes (THOM, 1972). The particles when used seldom plug the ORIFICE. These can be conveniently obtained in the range of 5 million particles per cubic MM.



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