Question

Figure shows two wave opulses at t=0 travelling on a string i opposite directions with the same wave speed `50 cms^-1`. Sketch the shape of the string at t=4ms, 6ms, 8ms and 12 ms.
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Answer 1

Correct Answer - A
The distance travelled by the pulses are shown below:
`t=4ms=4xx10^-3s,`
`s=vt=50xx10xx4xx10^-3`
=2mm
`t=8ms=8xx10^-3s`
`s=vt=50xx10xx8xx10^-3`
=4mm
`t=6ms=6xx10^-3s,`
`s=50xx10xx6xx10^-3`
=3mm
t=12ms
`=12xx10^-3s, `
`s=50xx10xx2xx10^-3`
`=6mm`
The shape of the string at different times are shown in the figure.