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 \( 1.6 \mathrm{~N} \). Identical wave
\( \mathrm{P} \) pulses are produced at one end at equal intervals of time \( \Delta t \).

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The minimum value of \( \Delta t \) which allows constructive interference between successive pulses is
[IIT 1998]
(a) \( 0.05 \mathrm{~s} \)
(b) \( 0.10 \mathrm{~s} \)
(c) \( 0.20 \mathrm{~s} \)
(d) \( 0.40 \mathrm{~s} \)
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