Physics An organ pipe that is open at both ends has a fundamental frequency of 389 Hz at 0°C.?

Question

An organ pipe that is open at both ends has a fundamental frequency of 389 Hz at 0°C. Using the fundamental frequency for this pipe at 20°C, what is the length of the organ pipe?

Answer 1

In air at sea level, the speed of sound is approximately 343 m/s at 20 °C. Hence the length of the organ pipe is;
(343m/s)/(389/s) = 0.882m (answer)