Milly, Krishna, Vinayak and Vasundhara were asked tto select the apparatus required to determine the speed of the pulse propagated through a stretched slinky, which is as given below :
a) thin silk string
b) thick cotton strings
c) thick cotton thread
​d) a stop clock
e) a table clock
f) thick silk string
g) a meter scale

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Please find below the solution to the asked query:

The will select a stop clock. Answer d) is correct.

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