If you find that the count rate is proportional to 1r2 where

If you find that the count rate is proportional to 1/r^2, where r is the distance from the Geiger counter, what can you conclude? Question 10 options:

The Geiger counter becomes ineffecient when it is farther apart from the source.

Air absorbs gamma rays very well resulting in a rapid drop in count rate.

The half-life of the radioactive substance being used is very short, few milli-seconds.

Radiation is uniformly emitted in all directions, and smaller amount is caught in the detector.

Solution

The ansser is,

Radiation is uniformly emitted in all directions, and smaller amount is caught in the detector.