Task id13811
A flow of freely propagating neutrons falls on an impenetrable wall of thickness L. A channel with a rectangular cross-section of width d = 10-3 cm and height h > d passes through the wall. Channel length L > h. Find the minimum particle velocity v in the incident beam at which neutrons can pass through the channel. What is v equal to in the case of a square cross-section of the channel dxd?
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