Question

_____A pipe that is open at both ends resonates at a fundamental frequency of 310 Hz. The next frequency it resonates at is most nearly 155 Hz 620 Hz 930 Hz 1240 Hz

Answer 1

Answer:

  (b) 620 Hz

Explanation:

You want the next resonant frequency of a pipe open at both ends if the fundamental resonance is at 310 Hz.

Open-ended

The media column in an open-ended pipe will resonate at frequencies such that there is a pressure node at both ends of the pipe. That is, the length of the pipe will be an integer number of half wavelengths of the frequency of vibration.

Then the frequency of vibration is an integral multiple of the speed of sound divided by twice the length of the pipe.

The next resonant frequency will be 2(310 Hz) = 620 Hz, choice B.