Why is the thickness of the layer of a strip of silver on the surface of the outer rotating cylinder in Stern’s experiment

Why is the thickness of the layer of a strip of silver on the surface of the outer rotating cylinder in Stern’s experiment not the same along the width of the strip?

The thickness of the silver strip layer on the surface of the outer rotating cylinder in Stern’s experiment is not the same over the strip width, since different speeds of silver atoms. The strip is thickest where the largest number of atoms reach.

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