In which medium does sound travel the fastest? a. salt water b. fresh water c. air *** d. cast iron a wave has a wavelength of 10 mm and a frequency of 5 hertz. what is its speed? a. 50 mm/s b. 50 hertz/s c. 2 mm/s 0.50 mm/s how does reflection differ from refraction and diffraction? a. reflection is the only process in which the wave does not continue moving forward. b. reflection is the only process that involves a change in the wave. c. reflection affects all types of mechanical waves, but refraction and diffraction do not. d. reflection is the only process that changes the direction.

1.  D - sound travels the fastest through solids

2. 50 mm/s - v=fa

3. B - only process that involves changing waves

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )