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Question

In an experiment on  determining the velocity of a pulse propagating through a stretched string, the stopwatch should be started and stopped at instants corresponding to the ones shown in :



(1) Fig. 1 and Fig. 2
(2) Fig. 1 and Fig. 3
(3) Fig. 2 and Fig. 1
(4) Fig. 2 and Fig. 3


Solution

As given in the figure, a wave pulse starts traveling from end A towards the end B. To calculate the velocity of the given wave, the stopwatch should be started at the instant corresponding to the figure A and should be stopped at the instant when the pulse reaches the other end, which corresponds to the figure 3. By dividing the distance travelled by the pulse from end A to end B with the time reading obtained by the stopwatch, we can easily determine the velocity of the given wave. 

Hence, the correct answer is option 2.

Science
Lakhmir Physics (2020, 2021)
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