calculate the fundamental frequency of an air column in a tube of leng

1.	calculate the fundamental frequency of an air column in a tube of length 25 cm closed at one end if the speed of sound in air is 350m/s
Answer» Given: An air column is in a TUBE of length 25 cm closed at ONE END if the speed of sound in air is 350 m/s. To find: Fundamental frequency ? Calculation: For $\rm fun dam ental$ frequency, we can SAY: $\dfrac{ \lambda}{4} = l$ $\implies \lambda = 4l$ $\implies \lambda = 4 \times 25$ $\implies \lambda = 100 \: cm$ $\implies \lambda = 1 \: m$ Now, frequency will be : $f = \dfrac{v}{ \lambda}$ $\implies \: f = \dfrac{350}{1}$ $\implies \: f = 350 \: hz$ So, $\rm fun dam ental$ frequency is 350 Hz.