A certain element consists of two stable isotopes. The first has a mass of 121 amu and a percent natural abundance of 57.3 %. The second has a mass of 123 amu and a percent natural abundance of 42.8 %. What is the atomic weight of the element? amu

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.