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## Homework Statement

Hello there,

There is a question that says :

...etc...the metal is then moved towards the hardboard. In moving 6.4cm, four further maxima are observed. Calculate the wavelength of the ...etc...

Now I know how to solve it, and got the answer.

(sine curve)

**But**why do we count the amplitudes both below in the and above the axis as maxima ?

I thought the maximum points are all the points above the x axis, and the minimum points are the minimum points ??!

## The Attempt at a Solution

All I did was : 4 max = 2[tex]\lambda[/tex] .. But these 4 maximum points are both ABOVE and BELOW the x-axis for a sine curve.

Then 2[tex]\lambda[/tex]=6.4cm

[tex]\lambda[/tex]=3.2cm

If you need me to explain my question exactly, please ask me to clarify.