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Q1. After being accelerated to a speed of 1.43×105, the particle enters a uniform magnetic field of strength 1.00 and travels in a circle of radius 33.0 (determined by observing where it hits the screen). The results of this experiment allow one to find.

Find out the ratio for this particle.

Q2. Estimate the thickness of lead shielding needed to reduce the exposure rate 2.5 m from a 5.92x10^11 Bq point source of Cs-137 to 1.0 mR/hr.

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