Josh and Nancy are at Coachella. They made plans to meet up after Flume's set, but for now, they're both watching Muse at the main stage, but from different locations. At Nancy's location the music has a sound intensity level of 70 decibels. At Josh's location, the music has a sound intensity level of 90 decibels. Assume, for simplicity of our model for this scenario, that the intensity of the music is same in all emission directions. What is the ratio r J /r N where r J is Josh's distance to the stage and r N is Nancy's distance to the stage?