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In resonators with nanoscale I-beams, which factor does not affect the mechanical frequencies of I-beams?

(a) Size

(b) Density

(c) Stiffness

(d) Distance between beam and bottom of the cavity

I have been asked this question during an internship interview.

The doubt is from RF and IF Processing Tradeoffs in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct option is (b) Density

For explanation: In resonators with nanoscale I-beams suspended over the cavity, the mechanical frequencies of I-beam are determined by size and stiffness of I-beam, and the distance between the beam and bottom of the cavity.

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