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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I Two hydrogen atoms collide head-on. The collision brings both atoms to a halt. Immediately after the collision, both atoms emit a photon. What was the spec of each atom just before the collision?
\| 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?
FIGURE Q38.5 is the current-versus-potential-difference graph for a photoelectric-effect experiment with an unknown metal. If classical physics provided the correct description of the photoelectric effect, how would the graph look if:
a. The light was replaced by an equally intense light with a shorter wavelength? Draw it.
b. The metal was replaced by a different metal with a smaller work function? Draw it.
A 75 kW radio transmitter emits 550 kHz radio waves uniformly in all directions. At what rate do photons strike a 1.5-m-tall, 3.0-mm-diameter antenna that is 15 km away?
What is the radius of a hydrogen atom whose electron moves at ?
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