A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to

A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to

A diffraction
B an echo
C resonance
D interference
E reverberation

waec 1988 physics

The correct answer is C. resonance

No explanation given

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