Two atmospheric sound sources A and B emit isotropically at constant power. The sound levels ? of their emissions are plotted in the figure versus the radial distance r from the sources. The vertical-axis scale is set by ?1 = 82.0 dB and ?2 = 68.0 dB. What are
(a) the ratio of the larger power to the smaller power and
(b) the difference in their sound levels at r = 9.60 m?