At the speed of sound
TJ and Rose Ann on the walk across campus, Rose Ann bringing the donuts.
Stravinsky pounds the boards together while Jeff times ten seconds. TJ is holding the GPS. He has just returned from measuring the distance.
Ryan tries his hand, or hands, at clapping the boards to produce the echoes. Clapping in synch with the echo allows the rest of the class to count the number of claps in ten seconds (hence the work Jeff is doing), and from that derive the speed of sound.
Trishia tries clapping the boards. Left to right is Joana, Emily, Gunwick, Judy, Trishia, and Jo.