("electron in a finite square potential well") electron can travel within a thin conducting tube, consisting of three electrically disconnected segments. the first and the third segment are at the potential и--9 v, whereas the second one is at ½ 0 v, both measured with respect to the ground. the electron has kinetic energy ke-2 ev in the region with potential v. (a) what is the kinetic energy of the electron in the middle region? (b) sketch a graph of the potential energy of the electron as a function of the distance from the center of the tube. assume each piece has a length l (c) usually, the electron will simply pass through. however, while in the central region, if the electron emits a photon, it can lose enough kinetic energy to become trapped between -l/2 and +l/2. the energy levels of the electron within the trap are: e ev, e2-2 ev, and es-4 ev, and the non-quantized region begins at e4-9 ev. what is the smallest energy the emitted photon can have?

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

3. dark matter

empty space could also be a simple vacuum