TS EAMCET 20-July-2022 Shift 2 Solved Paper

We know that, fundamental frequency produced in cylindrical open tube
f=‌

v

2L

.....(i)
where L= length of tube
When tube is dipped vertically in water so that half of its portion is in water, then it acts a closed pipe of length half of original length (‌

L

2

).
So, fundamental frequency of this closed tube,
f′=‌

v

4(‌ L 2 )

=‌

v

2L

=f
[from Eq. (i)]