A Physicist Wishes to Measure the Exposure of a Beam

question 29

Multiple Choice

A physicist wishes to measure the exposure of a beam of gamma rays. The beam is passed through 2.00 × 10^-2 kg of dry air at STP. The beam produces positive ions in the air which have a total charge of 3.87 × 10^-6 C. What is the exposure (in roentgens) of the beam?

• A)7.74 × 10^-8 R
• B)1.94 × 10^-4 R
• C)3.25 × 10^-2 R
• D)0.750 R
• E)1.25 R

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