Analysis
1. determine the water displaced
by the pencil by subtracting the
initial volume from the final
volume.
2. calculate the pencil's density by
dividing its mass by the volume of
water displaced.
3. compare the density of the pencil
to the density of water.

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.