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Chapter 38: Q 39 (page 1115)
Dinoflagellates are single-cell organisms that float in the world鈥檚 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?
Power of the flash is.
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An electron with a speed of collides with a hydrogen atom, exciting the atom to the highest possible energy level. The atom then undergoes a quantum jump with What is the wavelength of the photon emitted in the quantum jump?
If an electron is in a stationary state of an atom, is the electron at rest? If not, what does the term mean?
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. Explain why the graphs of Figure 38.3 are mostly horizontal for 鈭哣 > 0.
b. Explain why photoelectrons are ejected from the cathode with a range of kinetic energies, rather than all electrons having the same kinetic energy.
c. Explain the reasoning by which we claim that the stopping potential Vstop indicates the maximum kinetic energy of the electrons
What is the third-longest wavelength in the absorption spectrum of hydrogen?
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