- #1

Natchanon

## Homework Statement

Part C: Find fundamental frequency.

## Homework Equations

Tension(y) = μgy

v(y) = sqrt(gy)

Time it takes to travel from bottom to top = t_up = 2srqt(L/g)

## The Attempt at a Solution

I found part A and B, which are tension and velocity. I don't know how to find part C because velocity isn't constant so I can't just use f = (1/2L)sqrt(gy). I thought period was 2t_up, but that's wrong. The period is 4t_up, which I don't understand why. When the wave pulse reaches the ceiling, it changes phase and bounces back down, then it bounces up again with the same phase, then it changes phase to the same phase as the original pulse. Is that why we say period is 4t_up? When it comes back to the starting position with the same phase as the first incident wave?[/B]