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Which of the following is the disadvantage of using three stage tubes?

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Which of the following is the disadvantage of using three stage tubes?

(a) Reduced resolution

(b) Bulky construction

(c) Complex

(d) Heavy

The question was posed to me in an interview for internship.

I'm obligated to ask this question of Radiofrequency Mass Spectrometer in portion Mass Spectrometer of Analytical Instrumentation

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Right choice is (a) Reduced resolution

The explanation: The spurious lines can be reduced to a minimum by using three stage tubes. This results in reduced resolving power.

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