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
diffraction
an echo
resonance
interference
reverberation
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Definition The echoing, blending, and lingering of sound waves bouncing around a room. The intensification and sustained vibration of an object at its natural frequency.
Cause Multiple reflections of sound off hard surfaces in an enclosed or semi-enclosed space. An external force (sound wave) matching the natural frequency of an object or cavity.
Primary Effect Prolongs the duration of a sound, making it feel more "spacious" (like in a concert hall or cave). Makes a specific frequency, or a group of frequencies, much louder and fuller.
Example Hearing your voice continue to bounce around in an empty, tiled bathroom. Striking a tuning fork, which causes an identical, untouched tuning fork nearby to start vibrating and producing sound
