Calculate the present resistance of the variable resistor if the ammeter is reading 0.8A​

The answer is a i think

One splits the atoms and molecules  the other combines them

B) erini just took the test and it is correct

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.