Discussion
Why does a time-of-flight analyser have no upper mass limit in principle?
Answer: B
Nothing about the arrangement excludes a heavy ion; it merely arrives later, whereas a quadrupole's stability region and a sector's field strength both impose real ceilings. The voltage is fixed, the tube is a practical length, and detector response actually falls for very heavy ions. A technique whose only cost for a heavier analyte is patience is unusual, and it is why proteins are weighed this way. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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