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Which of the following leads to the limitation of resolution?

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Which of the following leads to the limitation of resolution?

(a) All ions do not have same energy

(b) All ions do not have same charge

(c) All ions are not of the same size

(d) All ions do not have the same charge

This question was posed to me during an online interview.

This intriguing question originated from Magnetic Deflection Mass Spectrometer topic in portion Mass Spectrometer of Analytical Instrumentation

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Correct option is (a) All ions do not have same energy

Easy explanation: The resolution is limited as all ions do not have the same energy. Hence, the ions would not have the same velocity.

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