A string of length \( 0.4 \mathrm{~m} \) and mass \( 10^{-2} \mathr...

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A string of length \( 0.4 \mathrm{~m} \) and mass \( 10^{-2} \mathrm{~kg} \) is tightly clamped at its ends. The tension in the string is 1.6
P \( \mathrm{N} \). Identical wave pulses are produced at one end at

W equal intervals of time \( \Delta t \). The minimum value of time interval, which allows constructive interference between successive pulses, is:
(1) \( 0.05 \mathrm{~s} \)
(2) \( 0.10 \mathrm{~s} \)
(3) \( 0.20 \mathrm{~s} \)
(4) \( 0.40 \mathrm{~s} \)
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