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The Pulse

Two slinky A ...

Question

Two slinky A and B of the same length are made up of two different materials. The time taken to travel 20 pulses in both of them are 70s and 90s respectively. In which slinky, the pulse travels faster and why?

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Solution

Velocity of the pulse = Distance travelled by the pulse / Time taken

It is clear that lesser the time taken faster will be the velocity of the pulse. Since the pulse takes less time to travel in A thus, the pulse travels faster in A than in B.

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Q. A student fixes a slinky to one end of a smooth table . He gives a transverse horizontal jerk to create a pulse in the slinky. The pulse completes four to and fro journeys along the length of the table . The time taken for the journey is 2.8 sec . The length of the table is 25 cm . What is the speed of the pulse moving on the slinky?

Q. If a pulse produced in a slinky takes 24 s to complete 6 journeys from end A to the other end B and then back to A, find the speed of the pulse along the slinky. Given the distance between the two ends, A and B is 4 m.

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