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The diameter of the polystyrene latex particles are ______________________

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The diameter of the polystyrene latex particles are ______________________

(a) 6  micron

(b) 6-20 micron

(c) 20 micron

(d) 6-14 micron

The question was posed to me during a job interview.

Enquiry is from Transmission of Video Images in chapter Telemedicine Technology of Biomedical Instrumentation

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Correct option is (d) 6-14 micron

The explanation is: 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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