$A$ pipe open at both ends and a pipe closed at one end have the same length and both are vibrating in their fundamental mode. If the air column vibrating in the open pipe has a resonance frequency $n_1$ and the air column vibrating in the closed pipe has a resonance frequency $n_2$,then:
- A$n_1 = 2 n_2$
- B$n_1 = n_2$
- C$2 n_1 = n_2$
- D$3 n_1 = 4 n_2$
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