Which statement about electromagnetic waves is true?
a. electromagnetic waves require a medium to travel.
b. electromagnetic waves don't require a medium to travel.
c. the particles of the medium through which electromagnetic waves travel vibrate perpendicularly to the direction of the wave.
d. the particles of the medium through which electromagnetic waves travel vibrate parallel to the direction of the wave.

Electromagnetic waves don't require a medium to travel.

B.Electromagnetic waves don't require a medium to travel.

Explanation:  

Electromagnetic waves can travel both in space as well as medium. These are transverse waves i.e. when they travel in medium, the medium particles vibrate perpendicular to the direction of motion of wave.

A electromagnetic wave is composed of electric and magnetic fields perpendicular to each other. These fields generate each other and that is the way an electromagnetic wave carries energy forward. An electromagnetic wave travels at the speed of light in space and slows down in medium. So, the correct answer is that an electromagnetic wave does not require a medium to travel. It can travel in space.

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.