Q.

In the arrangement shown in figure a rectangular pulse and a triangular pulse approaching each other both with the pulse speed  0.5 cm/sec . The resultant pulse at t=2 sec .

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a

b

c

d

None of the above

answer is A.

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Detailed Solution

In 2 sec each pulse will travel a distance of 1 cm.Two pulses overlap between 0 and 1 cm as shown in figure. So, A1 and A2  can be added as shown in figure.
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In the arrangement shown in figure a rectangular pulse and a triangular pulse approaching each other both with the pulse speed  0.5 cm/sec . The resultant pulse at t=2 sec .