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A string of length 0.4m and mass 10^(-2) kg is tightly clamped at its ends. The tension in the string is 1.6N. Identical wave pulses are produced at one end at equal intervals of time, ∆t. The minimum value of ∆t which allows constructive interference between successive pulses is?

(a) 0.05s

(b) 0.10s

(c) 0.20s

(d) 0.40s

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The correct answer is (b) 0.10s

For explanation: Mass per unit length of the string,


Velocity of the wave in the string,


For constructive interference between successive pulses, the minimum time interval is


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