# Homework Help: Wavelenth and Velocoty

1. Apr 13, 2005

### coey

heya,

i'm trying to solve this problem for a prelab question of mine, i think the problem that i've been noticing is that i can't find the right formula which involves all the variables listed... anyway heres the question.

A longitudinal wave with a frequency of 6 Hz takes 1.0 s to travel the length of a 2.5-m Slinky (see Figure). Determine the wavelength of the wave in meters.
m

2. Apr 14, 2005

### QuantumMech

I think just use dimensional analysis.

The wave travels 2.5 m in 1.0 s so its velocity is 2.5 m/s. Divide this by 6 Hz (s^-1) and get 0.4167 m.

Formula might be $\lambda \nu = v$ .

Last edited: Apr 14, 2005
3. Apr 14, 2005

### Ouabache

Do you know the relationship between frequency and wavelength?

it may not be clear but their equation actually reads: $$\lambda\nu = v$$ the $$\nu$$ is the greek letter nu.

Once you know the relationship, you have all the elements to find the wavelength..

edit: looks like QM already posted a solution. I was trying to help you figure it out yourself.

Last edited: Apr 14, 2005