At the very end when Neil deGrasse Tyson spoke about the types of of light and showed what they would look like in a cityscape until the end of the show. Name one that he did NOT mention in that segment?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

I’ve been stuck on this for a while

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?