AP EAMCET Engineering 22 Apr 2019 Shift 2 Paper

A metal wire of length 80 cm area of cross-section 3 mm2 and material density 3000 kg m−3 is joined to another metal wire of length 60 cm. area of cross-section 1 mm2 and material density 9000 kg m−3 . The free ends of the two wires are stretched between two rigid supports and a tension of 40 N is produced in the wires. The minimum frequency of the timing fork which can produce stationary waves with the joint of the wires as a node is