Hey. In class at the moment we are studying sound. Ive just read about resonance. Now, from what i understand, resonance is the induced vibration in an object from another object which is vibrating at its natural frequency, via contact with air molecules, a sound board etc. Now, the article is slightly unclear about one thing, which is what im asking. If i have an object vibrating at its natural frequency, will it induce vibration of the same frequency in ALL other objects, or only those objects which have the same natural frequency? And if so, why is this? Thanks in advance, Dan.