C Sketch graphs to show how each of the following vary with time:
i domestic supply ac voltage
ii domestic supply ac voltage converted to dc by a diode
iii voltage output from a battery.

Answer sample (c); // would be best because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest;

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.

Which bounce was made with the greatest force? d) bounce 4