While performing some vibration measurements on a lightly damped structure it is desired to measure the amplitude of two peaks in the spectrum due to two vibration modes. The modes are estimated to be resonant at $320$ Hz and $330$ Hz$.$

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What is the minimum frequency resolution required such that the amplitudes of the peaks can be measured with reasonable accuracy? Round your answer to an appropriate whole Hertz value.

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Your answer should be accurate to $+/-0\mathrm{.}1.$