Please choose the correct answer to the question: An organ pipe produces a musical note same number of nitrogen gas molecules. with a wavelength of 2.72 m. What is the frequency of this note if the speed of sound is 348 m/s?

Answer1: 85.7 Hz Answer2: 128 Hz Answer3: 260 Hz Answer4: 466 Hz

Answer format: answer1/answer2/answer3/answer4
Answer: answer2