Answer Happy

A. Consider the diagram below showing the two sources and a point labeled P in front of them. We want to figure out if the waves interfere constructively or destructively (or something in between) at P. Source A Source B AP The two sources A and B are emitting wave crests at the very instant this "picture" was taken. You can also see the previous three wave crests (in red). Of course, the waves really spread out in all directions as you saw in the simulation, but we're only interested in the part of the wave that travels towards the point P. 1. Add further equally spaced wave crests along each line. 2. Now add the position of wave troughs along each line, using a different color. 3. Is point P on a wave crest or in a wave trough with regards to the sound wave emitted by A? 4. Is point P on a wave crest or in a wave trough with regards to the sound wave emitted by B? 5. Is the point P therefore a point of constructive or destructive interference, or somewhere in between? 6. How would your picture change if we "waited" half a wave period? Would your answer to part 5 above still hold?