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PhysicsJEE Main 21 Jan 2026, Shift 1·Q18·MCQ·Easy–moderate

Waves · Wave motion

Two strings (A, B) having linear densities μA=2×10−4\mu_A = 2\times10^{-4} kg/m and μB=4×10−4\mu_B = 4\times10^{-4} kg/m and lengths LA=2.5L_A = 2.5 m and LB=1.5L_B = 1.5 m respectively are joined. Free ends of A and B are tied to two rigid supports C and D, respectively creating a tension of 500 N in the wire. Two identical pulses, sent from C and D ends, take time t1t_1 and t2t_2, respectively, to reach the joint. The ratio t1/t2t_1/t_2 is:
  1. (1)1.08
  2. (2)1.90
  3. (3)1.67
  4. (4)1.18

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