Question

At low temperature, an electron can be trapped just above the surface of liquid helium. The interaction between the electron and the surface is modelled by the potential energy ????(????) = ?(????/?????2 )+ (????/?????4). (a) Show that the force acting on the electron is ????(????) = ? (2????/?????3) + (4????/?????5). (b) Copy this graph of the potential energy against distance and mark the equilibrium position of the electron (i.e. the position at which it is trapped at a constant distance from the surface). (c) What is the escape speed of the electron from this trapped position?

          At low temperature, an electron can be trapped just above the surface of liquid helium. The
interaction between the electron and the surface is modelled by the potential energy ????(????) = ?(????/?????2 )+
(????/?????4). (a) Show that the force acting on the electron is ????(????) = ? (2????/?????3) + (4????/?????5). (b) Copy this graph of the potential energy against distance and mark the equilibrium position of the electron (i.e. the position at which it is trapped at a constant distance from the surface). (c) What is the escape speed of the electron from this trapped position?

Added by Esther R.

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