NEET PhysicsClass 11Harmonics of strings and pipesMediumSingle correct

A pipe 0.85 m long is closed at one end and open at the other. The speed of sound in air is 340 m s⁻¹. Which of the following frequencies can NOT be a natural frequency of this pipe?

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A pipe 0.85 m long is closed at one end and open at the other. The speed of sound in air is 340 m s⁻¹. Which of the following frequencies can NOT be a natural frequency of this pipe?

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