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Time for a wave pulse to travel along a string from its tension and mass

This type of question, asked 3 times: 9 May 2023 S2, 14 May 2024 S2, 11 Apr 2026 S1. All 3 questions below, oldest first.

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  1. Question 1

    9 May 2023 S2

    9
    A string of mass 0.2 kg is under a tension of 2.5 N. The length of the string is 2 m. A transverse wave starts from one end of the string. The time taken by the wave to reach the other end is

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  2. Question 2

    14 May 2024 S2

    15
    A wire PQ has length 4.8 m and mass 0.06 kg. Another wire QR has length 2.56 m and mass 0.2 kg. Both have same radii and are joined. This wire is under tension of 80 N. A wave pulse is sent from end P. The time taken by the wave to reach the other end is (No power dissipated)

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  3. Question 3

    11 Apr 2026 S1

    122
    A string of length 0.50.5 m and mass 10−310^{-3} kg is tightly clamped at its ends. The tension in the string is 0.80.8 N. Identical wave pulses are produced at one end at equal intervals of time Δt\Delta t. What is the minimum value of Δt\Delta t which allows constructive interference between successive pulses?

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