9. Steradian is the angel which lies in:
a) One dimension
b) Two dimensions

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

Positrons are spontaneously emitted from the nuclei of