Teaching MPPSC Assistant Professor Mock Test Series 2025 Physics Waves

A wire of length L and mass per unit length 6.0 × 10-3 kgm-1 is put under tension of 540 N. Two consecutive frequencies that it resonates at are: 420 Hz and 490 Hz. Then L in meters is:

1
5.1 m
2
1.1 m
3
2.1 m
4
8.1 m

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