Originally Posted by TheRealEar
For the question I would have thought A because it sounds like the same principle as a libby horn but I wouldn't be surprised if I was wrong.
Also, just to clarify...I am not the "shady" classmate that Dusty mentioned earlier and I also look forward to an entertaining story!
Well, you C people are right -- I thought it was A also because of the Libby horn. By lengthening tubing, I figured all frequencies would be attenuated. Think of doing a listening check with a stethoscope with long tubing vs short -- it sounds louder with the shorter tubing. It's also like having a larger ear canal volume -- more air to push around. I truly don't get the C answer, but they didn't really explain it. A longer earmold takes up more volume in the ear canal leaving less space and thus less air to move around. I will have to ask at my placement on Weds. I have a wizard of a supervisor.