Questions
A string of length 0.4 m and mass 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 . The minimum value of which allows constructive interference between successive pulses is
detailed solution
Correct option is B
For string, MassLength=m=10−20.4=2.5×10−2kg/m∴ Velocity v=Tm=162.5×10−2=8m/sFor constructive interference between successive pulses. Δtmin=2lv=2(0.4)8=0.1sec(After two reflections, the wave pulse is in same phase as it was produced since in one reflection it’s phase changes by π, and If at this moment next identical pulse is produced, then constructive interference will be obtained.Similar Questions
A wire having a linear density of 5 g/m is stretched between two rigid supports with a tension of 450 N. It is observed that the wire resonates at a frequency of 420 Hz. The next highest frequency at which the same wire resonates is 490 Hz. Find the length of the wire. (in m)
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