After walking across a carpet, a boy feels a spark between his hand and a doorknob.

if the boy's hand is negatively charged just before he touches the doorknob, which particles moved from the carpet to his hand (chose one of the answers below)

a atoms
b electrons
c neutrons
d protons

Phase changes are chemical changes. true or false

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate