Which of the following statements is true?
a. light energy does not serve any useful purpose.
b. light energy is the same as sound waves.
c. light energy does not require a medium through which to travel.
d. light energy is a form of potential energy only.

Adisk with a radius of r is oriented with its normal unit vector at an angle q with respect to a uniform electric field. which of the following would result in an increase in the electric flux through the disk? check all that apply? a. increasing the area of the disk b. decreasing the given orientation angle of the disk c. decreasing the strength of the electric field d. increasing the given orientation angle of the disk, but not exceeding an angle of 90