AP EAMCET Engineering 21 Apr 2019 Shift 2 Paper

Consider the length of the tube be L
The fundamental frequency for the open organ pipe is, f=‌

V

2L

The figure below represents the 60% of tube is dipped vertically in water.
The length of the closed organ pipe is,
l′=‌

40

100

L
l′=‌

2L

5

The fundamental frequency of air column is,
f′=‌

V

4l′

Substitute the values in the above equation.
f′=‌

V

4(‌ 2L 5 )

f′=‌

5

4

(‌

V

2L

)
f′=‌

5

4

f