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In Figure. two pulses travel along a str...

In Figure. two pulses travel along a string in opposite directions. The wave speed v is 2.0 mls and the pulses are 6.0 cm apart at t =0.

(a) Sketch the wave patterns when t is equal to 20 ms.
(b) In what form (or type) is the energy ofthe pulse at t= 15 ms?

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At t = 0 sec

(a) At t = 20ms.
Distance travelled by the first pulse in 20 ms is
`= Vt =2 xx 20 xx 10^(-3) = 4cm`.
Distance travelled by the second pulse in 20 ms is also
`= Vt =2 xx 20 xx 10^(-3) = 4cm`

(b) At t = 15 ms, by the principle of superposition resultant wave displacementis zero. Hence, the shape of the string is straight at t = 15 ms. Hence, total energy is purely kinetic.

t = 15 ms.
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