Unformatted text preview: Problem of the Week 8 Below is a potential energy curve for the interaction of two neutral atoms. The two
atom system is in a quantum state marked by the heavy solid horizontal line. The horizontal axis represents the separation r between the two atoms. 0 eV
–0.2 eV
–0.4 eV
–0.6 eV
–0.8 eV
–1.0 eV
–1.2 eV
–1.4 eV
–1.6 eV r1
r (a) At r = r1, what are the approximate values of the kinetic energy K, the potential energy U, and the sum K + U? (b) What minimum energy must a photon have so that absorbing the photon will cause the two atoms in this state to separate? (c) When r is large, this potential energy can be expressed approximately as
a
U = ! 6 . For large r, what is the magnitude of the force the two atoms exert on r
each other? ...
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 Fall '08
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