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Chapter 38: Q. 1 (page 1114)
Which metals in Table 38.1 exhibit the photoelectric effect for (a) light with and (b) light with ?
a. Sodium
b. Iron.
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Determine the wavelengths of all the possible photons that can be emitted from the state of a hydrogen atom.
Consider a hydrogen atom in stationary state n.
a. Show that the orbital period of an electron in quantum state n is, and find a numerical value for
b. On average, an atom stays in the n = 2 state for 1.6 ns before undergoing a quantum jump to the n = 1 state. On average, how many revolutions does the electron make before the quantum jump?
\| An electron with 2.00 mathrm{eV of kinetic energy collides with the atom shown in FIGURE EX38.24.
a. Is the electron able to excite the atom? Why or why not?
b. If your answer to part a was yes, what is the electron's kinetic energy after the collision?
Very large, hot stars—much hotter than our sun—can be identified by the way in which ions in their atmosphere absorb light. What are the three longest wavelengths, in nm, in the Balmer series of ?
A photoelectric-effect experiment finds a stopping potential of when light of is used to illuminate the cathode.
a. From what metal is the cathode made?
b. What is the stopping potential if the intensity of the light is doubled?
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