Which statement correctly compares the speed of light? a the speed of light through space is much greater than 3 x 108 m/s. b the speed of light in glass is much greater than 3 x 108 m/s. c the speed of light in glass is faster than the speed of light through space. d the speed of light in glass is slower than the speed of light through space.

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form