PhysicsLAB AP Free Response Question
2011 B6 Form B

The figure below shows the energy-level diagram for a hypothetical simple atom. The wavelength of the radiation emitted when an electron undergoes transition B is 400 nm, and for transition C it is 700 nm.
 (a) Calculate the wavelength of the radiation emitted when an electron makes transition A.

The photon emitted during transition B is then incident on a metal surface of work function 2.46 eV.
 (b) Calculate the maximum kinetic energy of the electron ejected from the metal by the photon.

 (c) Calculate the de Broglie wavelength of the ejected electron.

(d) Photons emitted during which of transitions A and C, when incident on the metal surface, will also result in electrons being ejected from the metal? Justify your answer.

_____ A only
_____ C only
_____ Both A and C
_____ Neither A nor C

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