31. Five mark exercise problem VIII

Music has been played in two opposite galleries with a certain group of people. For example, in the first gallery, a group of 4 singers were singing, and in the second gallery, 9 singers were singing. The two galleries are separated by a distance of 70 \(m\). Where should a person stand for hearing the same intensity of the singer's voice?

 

(Hint: The ratio of the sound intensity is equal to the square of the ratio of their corresponding distances.)

 

A person should stand 27 m30 m28 m from the first gallery.

 

A person should stand 42 m40 m45 m from the second gallery.