Two identical wires have the same fundamental frequency of 400 Hz. when kept under the same tension. If the tension in one wire is increased by 2% the number of beats produced will be 

(1) 4

(2) 2

(3) 8

(4) 1

(1) nTΔnn=12ΔTT

Beat frequency =Δn=12ΔTTn=12×2100×400=4

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