In the experiment for determining the velocity of propagation of a pulse in a slinky/string, we prefer a long slinky/string

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Because the pulse cannot be formed in a short slinky/string.

Because short slinky/string is cheap.

So that pulse may move through it easily

So the time taken by the pulse to move from one end of the slinky/string to the other is more.

answer is D.

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Detailed Solution

In the experiment for determining the velocity of propagation of a pulse in a slinky/string, we prefer a long slinky/string so the time taken by the pulse to move from one end of the slinky/string to the other is more.
Since travelling a pulse from one part to the other in a slinky/string is a rapid process, a more extended string/slinky is preferred to make a clear observation. Also, a long string/slinky is used so that time taken by the pulse to travel is more, and we get more precise results. If we use some other substance, then it will take a long time to show the results.

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