A cosmic ray interacts for a mere 11fs with its detector, Ask an Expert

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A cosmic ray interacts for a mere 11fs with its detector. Having just learned about the uncertainty principle, you realize that this interaction time establishes a precision limit on measurement of cosmic-ray energy.

A. Find the minimum uncertainty in that energy.

B. Find the fractional uncertainty for a 4.5 MeV cosmic ray. (?E/E=?)

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