Figure a shows a thin tube in which a finite potential trap has been set up where V2 = 0 V. An electron is shown traveling rightward toward the trap, in a region with a voltage of V1 = ?? 9.00 V, where it has a kinetic energy of 2.00eV. When the electron enters the trap region, it can become trapped if it gets rid of enough energy by emitting a photon. The energy levels of the electron within the trap are E1 = L.0, E2 = 2.0, and E3 = 4.0eV and the non-quantized region begins at E4 = 9.0eV as shown in the energy-level diagram of figure b. What is the smallest energy (eV) such a photon canhave?

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Nonquantized- F4 Tube E, Ve (a) (b) Energy