The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?

The intensity at distance 2d from source is    

Explanation:

From the question we are told that

     The distance of the wave from point source is  d  

     The  intensity is    

     The distance we are considering is  2d

Generally the intensity of a wave is mathematically represented as

Here P is power of point source      

Now when  d =  2d

    =>    

a straight line sloped

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).