![In a vibroscope, the fundamental resonant frequency of fibre X is twice that of fibre Y](https://www.gkseries.com/blog/wp-content/uploads/2023/09/In-a-vibroscope-the-fundamental-resonant-frequency-of-fibre-X-is-twice-that-of-fibre-Y.jpg)
Q. In a vibroscope, the fundamental resonant frequency of fibre X is twice that of fibre Y. Keeping the test length and tensioning weight the same, if the linear density of fibre Y is 10 denier, then the linear density (denier) of fibre X (rounded off to 1 decimal place) is