Which is the best definition of refraction? a) light or sound waves change direction. b) light or sound waves bounce off a medium. c) light or sound waves move from one area to another. d) light or sound waves increase their rate of dispersion.

The correct answer is "Light or sound waves change direction"

Explanation:

Refraction: Refraction occurs when a light rays gets bend while travelling from one medium to the another medium due to change in the speed of light or change in the direction. From the given options, the best definition of refraction is "Light or sound waves change direction".

Reflection: Reflection occurs when the light rays get reflected back from the obstacle in a same medium without getting absorb or transmit in it.

From the given options, the best definition of reflection is "Light or sound wave bounce off a medium.

Therefore, the correct option is (A).

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )