why do electromagnetic waves not require a medium for travel?
a)
because electromagnetic waves travel too fast for stationary particles to move with them
b)
because electromagnetic waves transmit energy without compressing the particles of the medium
c)
because electromagnetic waves generate their own particles for compression and use these for movement
d)
because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-d space

Explain why electric current cannot exist if a current doesn't have a voltage source.

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

Astone is thrown with a speed v0 and returns to earth, as the drawing shows. ignore friction and air resistance, and consider the initial and final locations of the stone. which one of the following correctly describes the change δpe in the gravitational potential energy and the change δke in the kinetic energy of the stone as it moves from its initial to its final location? options a.δpe = 0 j and δke = 0 j b.δpe is positive and δke is negative c.δpe = 0 j and δke is positive d.δpe is negative and δke is positive e.δpe = 0 j and δke is negative