A gas is filled in an organ pipe and it ...

A gas is filled in an organ pipe and it is sounded in fundamental mode. Choose the correct statement(s) (T=constant)

If gas is changed from `H_(2) to O_(2)`, the resonant frequency will increase

If gas is changed from `O_(2) to N_(2)`, the resonant frequency will increase

if gas is changed from `N_(2) to He`, the resonant frequency will decrease

If gas is changed from `He to CH_(4)`,the resonant frequency will decrease

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B, D

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