In spite of an electrostatic force of repulsion between positively charged particles in close proximity, tightly bound atomic nuclei exist because the force of gravitational attraction between the particles overcomes that repulsive force. a) true
b) false

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.