Explain the effect increasing temperature has on the following situations and what is happening at the molecular level to cause it.
(a) the speed of sound in air
(b) the current in a wire
THANKS
(a)The speed of sound goes up with temperature because the atoms collide with each other more often.
(b) The resistivity of most metals increases with temperature. The reason is rather complicated. Vibrating solid metal atoms start to restrict the flow of free electrons. Current drops slightly.