During isotopic analysis, the pressure of the vapours of the ions maintained in the ionization chamber of mass spectrometer Is:
Correct answer: A. Around 10-7 torr
- A. Around 10-7 torr
- B. 1 torr
- C. Around 10-3 torr
- D. 10-7 torr
Explanation
Explanation:The pressure of these vapors is kept very low that 10-6 to 10-7 torr. "1 torr" is a higher pressure range that may be used in some mass spectrometers for certain types of analyses, but it is generally not used for isotopic analysis. These options are also incorrect. During isotopic analysis, the pressure of the vapors of the ions maintained in the ionization chamber of mass spectrometer is around 10-7 torr, not 10-3 or any other.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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