JEE Main 2024 Physics question
A sonometer wire of resonating length 90 cm has a fundamental frequency of 400 Hz when kept under some tension. The resonating length of the wire with fundamental frequency of 600 Hz under same tension cm.
Answer: 60
Solution
f ∝ 1/ℓ at fixed tension: ℓ = 90 × 400/600 = 60 cm.