Why do sound waves do not travel in empty space ?

a. because sound waves do not need matter to travel.

b. because sound waves need matter to travel.

c. because sound waves need vacuum to travel.

d. none of the above

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

How can you increase the strength of an electromagnet?

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums