You've decided to install a pipe organ in your living room. Unfortunately, your ceiling is only 3.1m high. To reach the lowest notes possible, you've decided to use pipes closed at the floor end and open at the top, where they'll be sounded. You need 50cm clearance at the top end to install the compressed-air box and mount the pipes in the box.
If you keep your living room at 20 degrees C, what is the frequency of the lowest note that you will be able to obtain from your organ?