Question

Select the incorrect statement from the following option.

(a) In the Coulter counter, a narrow orifice is immersed in an electrolyte

(b) The resistance across the orifice is continuously noted on an oscilloscope

(c) The pulses occurring on the oscilloscope are counted electronically

(d) The magnitude of the pulse is inversely proportional to the volume of the electrolyte displaced

I had been asked this question in an online quiz.

The query is from Particle Size Measurement topic in portion Criteria of Purity and Characterisation of Materials of Engineering Chemistry I

Answer 1

Correct option is (d) The magnitude of the pulse is inversely proportional to the volume of the electrolyte displaced

To explain: The magnitude of the pulse is directly proportional to the volume of the electrolyte displaced and therefore to the volume of the particle. All the other options are correct.