A pipe open at both ends resonates at a fundamental frequency $f$ open. When one end is covered and the pipe is again made to resonate, the fundamental frequency is $f$ closed $.$ Which of the following expressions describes how these two resonant frequencies compare?

$f_{\text{c}\text{l}\text{o}\text{s}\text{e}\text{d}}=f_{\text{o}\text{p}\text{e}\text{n}}$

none of these

$f_{\text{c}\text{l}\text{o}\text{s}\text{e}\text{d}}=2f_{\text{o}\text{p}\text{e}\text{n}}$

$f_{\text{c}\text{l}\text{o}\text{s}\text{e}\text{d}}=(\frac{1}{2})f_{\text{o}\text{p}\text{e}\text{n}}$

$f_{\text{c}\text{l}\text{o}\text{s}\text{e}\text{d}}=(\frac{3}{2})f_{\text{o}\text{p}\text{e}\text{n}}$