# GRE Physics GR 1777 Problem Solution

## 031. Optics and Wave Phenomena (Standing waves)

where n is the harmony, v is the speed of sound, L is the length of the pipe.

•  The frequency of only one fixed end

Note that for the case where one end is closed, n only takes odd values just like in the case of the string fixed at only one end.

•  The frequency of two closed ends