An open pipe is 1.42 m long What fundamental frequency
does it produce?
(Speed of sound = 343 m/s)
(Unit = Hz)

the fundamental frequency produced by the open pipe is 120.78 Hz

Explanation:

Given;

length of the open pipe, L = 1.42 m

speed of sound in air, v = 343 m/s

The length of the open pipe for the fundamental frequency is equivalent to half of wavelength;

The fundamental frequency produced by the open pipe is calculated as;

Therefore, the fundamental frequency produced by the open pipe is 120.78 Hz

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray