Why can't we consider a larger bandwidth when resonating objects

[Zack H]

Regarding resonance and using one signal to cause another object to resonate:

I read that we do not consider input frequencies outside of the 70.7% boundary when attempting to make an object resonate, surely even frequencies further away from the resonant frequency will still make the object resonate slightly (as they are still under the bell curve). While their effect diminishes exponentially, I don’t understand why we choose to stop at 70.7%?

(this is intended to be one of the questions for the lecture on Thursday, I was unsure if there was a better place to put my question)

[Simon]

We covered this in the week 2 lectures.

[Author]

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