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## Homework Statement

A detector is used to count the number of gamma rays from a radioactive source if the number of counts is 10000 in exactly 20 secs then what is the error in counting rate per sec?

## Homework Equations

- no idea.## The Attempt at a Solution

- As per our syllabus we had only done Geiger muller counter which gives a dead time & from that we can calculate the error. However that is not given here. SO I got no idea to approach. Please help.Options given- 5%, 22.4%, 44.7%, 220% (absolute values all).

Question source TIFR GS 2010.