Science! owo it is due tommorow.

Light changes speed as it moves from one medium to another.
This causes light of different colors to be refracted differently and to leave the prism at different angles, creating an effect similar to a rainbow.

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.

The awnser is  erosion for your question