JAMB - Physics (1991 - No. 29)
When the bottom tip of a vibrating tuning fork is held in contact with a wooden box, a louder sound is heard. This phenomenon is known as
beats
echoing
resonance
reverberation
説明
The wooden box is in forced vibration, and the louder sound(higher amplitude) heard arises from the fork's forcing frequency coinciding with the box's natural frequency.