Chapter 38: Q 11 (page 1113)
If an electron is in a stationary state of an atom, is the electron at rest? If not, what does the term mean?
No, the electron is not at rest.
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The diameter of the nucleus is about . A simple model of the nucleus is that protons and neutrons are confined within a one-dimensional box of length . What are the first three energy levels, in , for a proton in such a box?
An experiment was performed in which neutrons were shot through two slits spaced 0.10 mm apart and detected 3.5 m behind the slits. Figure P38.49 shows the detector output. Notice the scale on the figure. To one significant figure, what was the speed of the neutrons?
I FIGURE EX38.24 is an energy-level diagram for a simple atom. What wavelengths, in \mathrm{nm}, appear in the atom's (a) emission spectrum and (b) absorption spectrum?
FIGURE EX38.24 n=1-E_{1}=0.00 \mathrm{eV}
a. A negatively charged electroscope can be discharged by shining an ultraviolet light on it. How does this happen?
b. You might think that an ultraviolet light shining on an initially uncharged electroscope would cause the electroscope to become positively charged as photoelectrons are emitted. In fact, ultraviolet light has no noticeable effect on an uncharged electroscope. Why not?
FIGURE Q38.12 shows the energy-level diagram of Element X.
a. What is the ionization energy of Element X?
b. An atom in the ground state absorbs a photon, then emits a photon with a wavelength of 1240 nm. What was the energy of the photon that was absorbed?
c. An atom in the ground state has a collision with an electron, then emits a photon with a wavelength of 1240 nm. What conclusion can you draw about the initial kinetic energy of the electron?
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