Ablank is a statement the summerizes a pattern found in nature

Which notation is used to represent an alpha particle? a. b. c. d.

In what direction does an applied force move an object

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?