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Q.

Two pulses travel in mutually opposite directions in a string with a  speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10cm apart. What will be the state of the string after two seconds

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Detailed Solution

After two seconds each wave travel a distance of 2.5 × 2 = 5 cm i.e., the two pulses will meet in mutually opposite phase and hence the amplitude of resultant will be zero.
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