Problem_of_the_Week_8 - Problem of the Week 8 Below...

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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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