Home Physics Wave and Sound Mix A spring has a force constant k and mass m. …
Physics Wave and Sound Mix MCQ (Single Correct)

A spring has a force constant k and mass m. The spring hangs vertically and a block of unknown mass is attached to its bottom end. It is known that the mass of the block is much greater than that of the spring. The hanging block stretches the spring twice its relaxed length. How long (t) would it take for a low amplitude transverse pulse to travel the length of the stretched spring -

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The correct answer is:
A

Since mass of spring is small compared to the mass M , the tension force is approximately constant

where elongation of the spring
given.
where Relaxed length

mass per unit length

speed of wave

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