- #1

phoenix95

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## Homework Statement

A detector is used to count the number of gamma photons emitted by a radioactive source. If the number of counts recorded in exactly 20 seconds is 10000, the error in counting rate per second is

(a) 5.0

(b) 22.4

(c) 44.7

(d) 220.0

## Homework Equations

## The Attempt at a Solution

I don't know anything about this problem. I thought the counting rate would be 500 per second. I went through other threads, and in some Poisson distribution is mentioned. I don't know if it is relevant here... Can someone help me?

Thank you for your time...

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