# Natural Frequency Question

1. Jun 11, 2015

### Tam Le

Suppose a sound wave with multiple natural frequencies--a complex sound wave--strikes Object A. Some of those frequencies matches the natural frequencies of Object A.

A) Will Object A vibrate at all the different frequencies or only to its natural frequencies?

B) If Object A vibrates at all the different frequencies, does it vibrate more vigorously to its natural frequencies? In other words, will the amplitude of vibration of its natural frequencies be greater than the other frequencies?

2. Jun 11, 2015

### Drakkith

Staff Emeritus
I think it vibrates at all the frequencies, but the non-natural ones simply die off very quickly compared to the natural frequencies.

I believe so. That would appear to match the explanation given at wiki: http://en.wikipedia.org/wiki/Natural_frequency

3. Jun 12, 2015

### Tam Le

If that is true Drakkith, then wouldn't Object A produce a different complex sound wave compared to the incident complex sound wave? Thus, the sound wave I would hear from Object A would be a modified version of the incident sound wave.