1.
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Angular momentum values for an electron are shown projected on the z-x plane (only +x projection is shown and the y-axis is into the computer screen). The units of the x- and z-axes are in terms of h/2p (hbar). At the time shown, when the z-component of angular momentum is greatest, what is the x-component of the angular momentum? Start
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| Lx=2.24 h/2p. |
| Lx< 2.24 h/2p. |
| Lx= 5 h/2p. |
| Lx= 5.47 h/2p. |
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2.
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Wavefunctions for an electron in an idealized Hydrogen atom (Coulomb potential) are shown up to n=3. What is the relationship between the integers n and l and the number of zero crossings of the wave function?
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| n - one crossings. |
| n - 1 crossings. |
| n - 1 - one. |
| Cannot Determine. |
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3.
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The probability density, P(r) = y*y r2, for an electron in an idealized Hydrogen atom (Coulomb potential) for several states is shown as plotted versus distance given in Bohr radii. Rank the states by the electron's most probable position (least first).
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| 1s, 2p, 2s, 3d, 3p and 3s. |
| 1s, 2s, 2p, 3s, 3p and 3d. |
| 1s, 2s, 3s, 2p, 3p and 3d. |
| Cannot Determine. |
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4.
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The probability density, P(r) = y*y r2, for an electron in an idealized Hydrogen atom (Coulomb potential) for several states is shown as plotted versus distance given in Bohr radii. For which state(s) do(es) the most probable value(s) of the electron's position agree with the Bohr model?
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| 1s, 2p, and 3d. |
| 1s,2s, and 3s. |
| 1s. |
| Cannot Determine. |
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5.
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An electron undergoes a transition from n=2 to n=1 state. The above Moseley plot shows wavelength of the emitted photon versus Z. What is the wavelength of the X-ray emitted by the electron if it undergoes the transition in tin (Z=50)? Start
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| 0.52 nm. |
| 0.51 nm. |
| 140 km. |
| Cannot Determine. |
