The ratio of intensities of radiation at distances of R and 3R from a spherical source will be

The ratio of intensities of radiation at distances of R and 3R from a

1.	The ratio of intensities of radiation at distances of R and 3R from a spherical source will be
Answer» `1: 3` `9 : 1 ` `1: 9 ` `3 : 1` ANSWER :B