Which of the following frequencies could NOT be present as a standing wave in a 2m long organ pipe open at both ends? The fundamental frequency is 85 Hz.
A) 85 Hz.
B) 170 Hz.
C) 255 Hz.
D) 340 Hz.
E) 382 Hz.

Question

Quizplus · Accepted Answer

In a pipe open at both ends, the harmonics are integer multiples of the fundamental frequency. Given the fundamental frequency is 85 Hz, the harmonics would be 85 Hz, 170 Hz (2 x 85), 255 Hz (3 x 85), 340 Hz (4 x 85), etc. The frequency 382 Hz does not fit this pattern, making it the correct choice.

Which of the Following Frequencies Could NOT Be Present as a Standing