Question

a student was testing how light waves and sound waves would be affected by different materials. for one part of the experiment, the material seen in the picture was used. the light waves and sound waves were sent through the air before entering this material.
what results that you would expect the student to get in this experiment using the material shown?
light waves would speed up in the material, while sound waves would slow down in the material.
light waves would slow down in the material, while sound waves would speed up in the material.
light waves and sound waves would travel at the same speed through the material.
light waves would slow down in the material, while sound waves would be unaffected.

Explanation:

Light travels slower in denser mediums (like the material here compared to air). Sound travels faster in denser mediums (as particles are closer to transmit vibrations).

Answer:

Light waves would slow down in the material, while sound waves would speed up in the material.