For a given medium, sound waves travel more slowly at lower temperatures.  Having read the above passage, choose the right answer to the following question (choices are increase or decrease ):   If Milo is listening to the radio in his room and the room gets hotter, what happens to the speed of the sound waves generated by the radio increase or decrease?
increase

Warmer molecules vibrate faster than cooler ones.  Having read the above passage, choose the right answer to the following question (choices are faster or slower ):   Eric increased the heat of the molecules. They now vibrate faster or slower?
faster

Longer length resistors will offer more resistance than shorter resistors.  Having read the above passage, choose the right answer to the following question (choices are shorter. or longer ):   Ed is adding a resistor to a circuit. If he needs it to have less resistance, he should add a resistor that is shorter. or longer?

shorter.