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A string of length 0.4 m and mass 10 ^(-...

A string of length 0.4 m and mass `10 ^(-2)` kg is tightly clamped at its ends. The tension in the string is 1. 6 N. identical wave pulses are produced at one end at equal intervals of time `Delta t`. The value of `Delta t` which allows construction tnterference betwenn successive pulses is

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