Q. 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 in equal intervals of time $\Delta t$. The minimum value of $\Delta t$, which allows constructive interference between successive pulses, is :
AFMCAFMC 2004
Solution: