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Chapter 38: Q. 6 (page 1114)
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?
a. the metal is copper.
b. Stopping potential remains the same.
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Dinoflagellates are single-cell organisms that float in the world’s oceans. Many types are bioluminescent. When disturbed, a typical bioluminescent dinoflagellate emits 108 photons in a 0.10-s-long flash of wavelength 460 nm. What is the power of the flash?
How would the graphs of Figure 38.3 look if classical physics provided the correct description of the photoelectric effect? Draw the graph and explain your reasoning. Include curves for both weak light and intense light
In the atom interferometer experiment of Figure , laser cooling techniques were used to cool a dilute vapor of sodium atoms to a temperature of . The ultracold atoms passed through a series of collimating apertures to form the atomic beam you see circling the figure from the left. The standing light waves were created from a laser beam with a wavelength of .
a. What is the rms speed of a sodium atom in a gas at temperature ?
b. By treating the laser beam as if it were a diffraction grating. Calculate the first-order diffraction angle of a sodium atom traveling at the rms speed of part a.
c. how far apart are the points and if the second sanding wave is from the first?
d. Because interference is observed between the two paths, each individual atom is apparently present at both points and point Describe, in your own words, what this experiment tells you about the nature of matter.
Through what potential difference must an electron be accelerated from rest to have a de Broglie wavelength of ?
A ruby laser emits an intense pulse of light that lasts a mere 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 500 mJ. a. How many photons are emitted in each pulse? b. What is the rate of photon emission, in photons per second, during the 10 ns that the laser is “on”?
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