Understanding Amplitude and Waveforms

[Arun Raja]

Homework Statement

http://puu.sh/bZQiV/43f7515806.png

Homework Equations

This is a conceptual conception so no equations[/B]

The Attempt at a Solution

I believe answer is D since it is the longest and thus can have the highest amplitude.
Is it correct?[/B]

 

[Simon Bridge]

Being able to have the highest amplitude is no guarantee that it does have the highest amplitude.
For instance, the longest rod is also the most massive (all other things being equal) so it would have the lowest amplitude for the same energy.

This is a coupling/resonance question.