1) The fundamental frequency of an air column in a pipe closed at one end is 100 Hz. If the same pipe is open at both ends, the frequencies produced in Hz are A) 100,200,300,400,..... B) 100,300,500,700,.... C) 200,300,400,500,.... D) 200,400,600,800 Answer: Option DExplanation: For a closed pipe fundamental frequency, $v_{1}=\frac{v}{4L}=100 Hz$ For an open pipe fundamental frequency, $v_{1}=\frac{v}{2L}=200 Hz$ In a pipe open at both the ends , all multiples of the fundamental are produced
