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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 10 cm apart. What will be the state of the string after two seconds?

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a

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b

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c

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d

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answer is C.

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Detailed Solution

After two seconds each wave travel a distance of 2.5 x 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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